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GS Paper: GS3-16.Achievements of Indians in Science & Technology

  • Draft rules under the SHANTI Act could favour Russia’s Rosatom in India’s nuclear opening

    Why in the News

    Draft rules issued by the Department of Atomic Energy under the Sustainable Harnessing and Advancement of Nuclear Energy for Transforming India (SHANTI) Act require any foreign nuclear technology brought into India to be design certified by the regulator in its country of origin and already operational there or in another foreign country. Only two Small Modular Reactors are operational anywhere in the world, so a clause written as a safety filter narrows India’s field of eligible suppliers to the one country that already has an operating unit.

    Mentor’s Comment

    A proven technology test is the most defensible condition a regulator can write. It is also the condition that most reliably locks out every new entrant, because nothing can be operational before someone allows it to operate somewhere first.

    What is the SHANTI Act?

    1. Full name: The Sustainable Harnessing and Advancement of Nuclear Energy for Transforming India Act, referred to as the SHANTI Act.
    2. Function: It is the statute under which India’s expansion of nuclear power generation is being governed, including the terms on which foreign nuclear technology may be sourced for an Indian plant or reactor.
    3. Rule making authority: The Department of Atomic Energy (DAE) frames the subordinate rules under the Act, and has now issued them in draft.
    4. Operative clause in the draft rules: Foreign nuclear technology sourced for a nuclear power plant or reactor in India must mandatorily carry design certification or approval from the regulatory body in its country of origin, and must already be operational there or in another foreign country.

    What is a Small Modular Reactor?

    1. Definition: A Small Modular Reactor (SMR) is an advanced nuclear reactor with about one third the generating capacity of a conventional large power reactor, built from factory made modules rather than site fabricated components.
    2. Intended use: SMRs are aimed at supplying clean electricity to remote regions with limited grid infrastructure and to individual industrial enterprises.
    3. India’s interest: India is examining SMRs for localised applications such as energy hungry data centres, and for scaling up baseload capacity quickly.

    What do the draft rules actually require of a foreign supplier?

    1. Home regulator certification: The design must be certified or approved by the regulatory body of the technology’s country of origin.
    2. Prior operating record: The technology must already be operational in that country or in another foreign country.
    3. Cumulative condition: Both tests must be met together, so a design certified but not yet built fails the rule, and a demonstration unit without home regulator certification also fails it.
    4. Practical filter: The clause screens out first of a kind designs, which is the entire category most SMR developers currently sit in.

    What does the global SMR field look like?

    1. Russia, Akademik Lomonosov: A floating power unit with two modules of 35 MWe that began commercial operation in May 2020. It is a non self propelled power barge docked at Pevek harbour, supplying heat to the Arctic port town and electricity to the regional grid, and is the world’s northernmost nuclear power plant.
    2. China, HTR-PM: A demonstration project grid connected in December 2021 that started commercial operations in December 2023, the second of the two SMRs operational globally.
    3. United States, Holtec International: The New Jersey based developer’s SMR is still in the design certification phase and is yet to be cleared by its domestic regulator.
    4. United Kingdom, Rolls-Royce SMR: Also in the design certification phase, with no operating unit anywhere.
    5. United States, GE-Hitachi BWRX-300: A boiling water reactor derived SMR, likewise awaiting domestic regulatory clearance.
    6. What the set demonstrates: Only Russia and China clear the operational test today, and Russia is the only country in the world with expertise in floating nuclear power solutions.

    What is Russia already positioned to supply in India?

    1. Existing build: Russia is already constructing conventional nuclear projects in India and holds a lead in the nascent SMR field.
    2. Kudankulam: The Kudankulam Nuclear Power Project (KKNPP) in Tamil Nadu is India’s largest nuclear power station and the flagship project of Russian and Indian energy cooperation. Units 1 and 2 use Russia’s earlier VVER-1000 light water reactors, where water cools the reactor, and are connected to the national grid supplying south India.
    3. Serial construction pitch: A key negotiating point from the Russian side is serial construction of high capacity units of Russian design in India based on the new generation VVER-1200 reactor models, with technical specifications being proposed by Russia.
    4. SMR pitch: Rosatom State Corporation has made a strong pitch for deploying its SMRs for targeted applications in India, and construction of SMRs of Russian design in India is under discussion.
    5. Floating solutions: In April 2024, Rosatom presented its Indian partners with information on its floating nuclear power solutions.
    6. Bilateral track: Progress on Kudankulam and the SMR proposal was reviewed at a working meeting in Mumbai on 10 November between the Chairman of the Department of Atomic Energy and the Director General of Rosatom.

    Why does cost also point the same way?

    1. Indigenous benchmark: India’s indigenous pressurised heavy water reactors (PHWRs) cost about Rs 18 crore per MW-electric.
    2. Russian comparison: Russian reactors are estimated at about Rs 34 crore per MW-electric, which industry insiders describe as only marginally more expensive.
    3. Western comparison: Light water reactors offered by French and United States companies are significantly more expensive than India’s indigenous PHWRs.
    4. Where the cost sits: Fuel accounts for a relatively small share of the overall cost of nuclear generation, so the capital number dominates.
    5. Financing and time: High upfront capital cost remains the key challenge for new projects, and financing costs and the length of the construction period are critical determinants of the final cost of nuclear power.

    What are the other major changes in India’s nuclear framework?

    1. Change to an existing monopoly: The reform track opens nuclear power generation beyond the exclusive preserve of state owned entities, which the Atomic Energy Act, 1962 had reserved for the government.
    2. Change to an existing liability regime: The Civil Liability for Nuclear Damage Act, 2010, whose Section 17(b) gives the operator a right of recourse against the supplier, is part of the same reform track because that provision is the standing deterrent for foreign vendors.
    3. New institutional target: A Nuclear Energy Mission for Viksit Bharat carries an outlay of Rs 20,000 crore for research and development on Small Modular Reactors, with at least five indigenously designed SMRs targeted to be operational by 2033.
    4. New capacity goal: A national target of 100 GW of nuclear capacity by 2047 anchors the entire framework, against present installed capacity of under 9 GW.
    5. New subordinate rules: The draft rules now released are the first set of subordinate legislation under the SHANTI Act governing sourcing of foreign nuclear technology.

    Does a proven technology test buy safety at the cost of competition?

    1. The case for the clause: A design already certified and operating abroad carries demonstrated safety performance, which is the strongest assurance a regulator can demand before a first Indian deployment.
    2. The cost of the clause: Almost every SMR developer is in the design certification phase, so a rule keyed to operating status excludes the field rather than ranking it.
    3. Competition effect: With Holtec, Rolls-Royce SMR and the GE-Hitachi BWRX-300 all outside the gate, price discovery for Indian projects narrows to one supplier’s quotation.
    4. Reciprocity problem: India’s own first of a kind designs have no operating record either, so a mirror clause applied abroad would keep Indian reactors out of foreign markets.
    5. Strategic dependence: Serial construction of VVER-1200 units plus SMR supply from the same country deepens a single supplier relationship in a sector with sixty year asset lives.

    Challenges to the design certification and prior operation clause

    1. The eligible field collapses to two countries: Only Russia and China have an operating SMR, e.g. Akademik Lomonosov since May 2020 and HTR-PM since December 2023, so every other developer is excluded until its home regulator acts.
    2. First of a kind Indian designs get no reciprocal entry: An indigenous SMR has no operating unit anywhere, e.g. the Bharat Small Modular Reactor of about 200 MWe exists only on paper, so a comparable foreign rule would bar it abroad.
    3. Supplier liability still deters western vendors independently of this clause: Section 17(b) of the Civil Liability for Nuclear Damage Act, 2010 has kept projects frozen, e.g. the Jaitapur project with French supply has been under negotiation since 2010 without a single unit built.
    4. Construction period risk dominates project cost: Long build times inflate financing cost, e.g. Kudankulam Unit 1 was sanctioned in 1988 and reached criticality only in 2013.
    5. Fuel supply remains external for safeguarded reactors: Imported uranium underpins the light water fleet, e.g. India sources uranium from Kazakhstan, Uzbekistan, Russia and Canada under Nuclear Suppliers Group waiver arrangements.
    6. Local acceptance and land acquisition delay siting: Public opposition has stalled commissioning, e.g. protests at Kudankulam through 2011 and 2012 delayed the first unit by over a year.
    7. SMR economics depend on serial factory production: A handful of units cannot amortise a module factory, e.g. Pevek’s barge served a single Arctic town, which is not a template for grid scale Indian demand.

    Conclusion

    The rules under the SHANTI Act are at the stage of a draft released by the Department of Atomic Energy for public comment, and the operative clause requires foreign nuclear technology to be design certified in its country of origin and already operational there or abroad. The next milestone is the close of the comment window on 4 September 2026, after which the rules are to be finalised and notified. As drafted, the clause leaves Rosatom as effectively the only qualifying SMR supplier, with Holtec International, Rolls-Royce SMR and the GE-Hitachi BWRX-300 all still in design certification.

  • ₹3,070 Crore Defence Boost: 405 Items to Go Indigenous

    Why in the News

    The Department of Defence Production notified the sixth Positive Indigenisation List, covering 405 strategically important defence items with an estimated business potential of Rs 3,070 crore. The list moves the import ban from whole platforms down to the spares, sub-assemblies and raw materials layer that keeps imported fleets flying and floating.

    What is the Positive Indigenisation List?

    1. Definition: A Positive Indigenisation List (PIL) is a notified list of defence items that can be procured only from Indian industry after a stated deadline passes.
    2. Legal effect: The listed item stays importable until its deadline. After that date, procurement is exclusively domestic.
    3. Issuing authority: The Department of Defence Production (DDP) under the Ministry of Defence notifies the list.
    4. Two families of lists: One family covers capital acquisition platforms for the armed forces. The second family covers line replaceable units, sub-systems, sub-assemblies, spares, components and raw materials of Defence Public Sector Undertakings (DPSUs), which is the family the sixth list belongs to.
    5. Policy anchor: The Ministry placed the sixth list within the Aatmanirbhar Bharat initiative for self reliance in defence manufacturing.

    What is a Line Replaceable Unit?

    1. Definition: A Line Replaceable Unit (LRU) is a self contained module on a platform that a technician can swap out at the operating unit itself, without sending the platform to a depot.
    2. Why it matters: LRU import dependence decides fleet availability, since an aircraft grounded for one imported module is as unusable as an aircraft never bought.

    What is the SRIJAN Defence Portal?

    1. Definition: The SRIJAN Defence Portal is the Ministry of Defence’s online indigenisation platform on which DPSUs and the Services publish items they currently import and invite Indian vendors to develop them.
    2. Use in this case: The detailed sixth list has been uploaded on the portal, so vendors can see item level specifications rather than only the headline count.

    Components of the sixth list, by lifecycle stage

    The release’s own categorisation phrase is “line replaceable units, sub-systems, sub-assemblies, spares, components and raw materials”. The table below keeps that official grouping and maps each element to the stage of the platform lifecycle it sits at.

    Official category (lifecycle stage)Platforms and systems coveredOfficial figuresPrimary stakeholder
    Raw materials (input stage)Feedstock for the listed platforms and systemsNo separate figure given in the releaseIndian industry, particularly MSMEs
    Components and spares (production stage)Armoured platforms T-72, T-90 and BMP-II, and warshipsNo separate figure given in the releaseDPSUs with MSME participation
    Sub-assemblies and sub-systems (assembly stage)Advanced Light Helicopter, Light Utility Helicopter, Chetak and Cheetah helicopters, Su-30MKI, Jaguar, MiG-29, the Light Combat Aircraft and the AL-31FP engineNo separate figure given in the releaseDPSUs, in house development route
    Line replaceable units (sustainment stage)Missile systems Konkurs-M, Invar and MRSAM, defence electronics covering radars, sonars, fire control systems and satellite communication systems, and High Explosive Anti-Tank ammunitionPart of the 405 items worth Rs 3,070 crore16 items for the Indian Coast Guard, 389 items for DPSUs
    Exclusive domestic procurement (offtake stage)All 405 listed itemsDeadlines running up to December 2031Indian industry as the sole permitted source

    Why does the list target spares and sub-systems rather than whole platforms?

    1. Sustainment is where imports survive: A platform built in India under licence still draws imported modules through its service life, so a platform level ban leaves the recurring import bill untouched.
    2. Legacy Russian and Western fleets stay in service: The Su-30MKI, MiG-29, Jaguar, T-72, T-90, BMP-II, Konkurs-M and Invar are all of foreign origin and remain in front line use, so their spares are the standing demand.
    3. MSMEs can enter at this scale: The Ministry stated that DPSUs and the Indian Coast Guard will indigenise through several routes including in house development, with participation from industry and particularly MSMEs.
    4. Deadlines create assured demand: Once an item is developed locally, it will be procured exclusively from Indian industry, which converts a technical goal into a guaranteed order.
    5. Stated economic objective: The Ministry expects the list to expand opportunities for Indian industry, strengthen the domestic defence manufacturing ecosystem, promote investment and innovation, and reduce import dependence.

    What does the record of the previous five lists show?

    1. Cumulative coverage: The last five positive indigenisation lists together comprised 5,012 critical items of DPSUs.
    2. Delivery so far: 3,200 of those items have already been indigenised.
    3. Value realised: The indigenised items carry an import substitution value of over Rs 3,900 crore.
    4. Completion gap: 1,812 items from the earlier five lists remain to be indigenised even before the sixth list’s 405 are added.
    5. Scale of the new tranche: The sixth list’s Rs 3,070 crore business potential is close to the entire import substitution value the previous five lists have delivered so far.

    Challenges to the Positive Indigenisation List

    1. Design authority remains abroad: Reverse engineering a spare does not transfer the original equipment manufacturer’s design data, so upgrades and configuration changes still need foreign clearance, e.g. Su-30MKI serviceability fell sharply when Russian spares supply was disrupted after February 2022.
    2. Certification is the real bottleneck: A developed item still needs airworthiness or seaworthiness clearance before induction, and that queue is longer than the development itself, e.g. clearances from the Centre for Military Airworthiness and Certification for a single aviation grade module routinely run into years.
    3. An import ban does not create capability: Prohibiting an import without a working domestic alternative simply postpones the requirement, e.g. the Kaveri engine programme began in 1989 and the Light Combat Aircraft still flies on the imported GE F404.
    4. Working capital stress for small vendors: An MSME must fund development, tooling and inventory ahead of an order it may receive years later, e.g. procurement cycles under the Defence Acquisition Procedure, 2020 routinely run beyond 100 weeks from acceptance of necessity to contract.
    5. Quality escapes damage the case for domestic sourcing: A defective indigenous item costs more credibility than an imported one, e.g. the Comptroller and Auditor General’s 2019 report on ammunition management flagged defective ammunition from Ordnance Factory Board units causing accidents and monetary loss.
    6. Import substitution is not export competitiveness: Substituting an import for the home market does not make the product globally saleable, e.g. India stayed among the world’s largest arms importers through 2020 to 2024 even after five lists had been notified.

    Conclusion

    The sixth Positive Indigenisation List stands notified, with 405 items worth Rs 3,070 crore, split as 16 Indian Coast Guard items and 389 DPSU items, and uploaded on the SRIJAN Defence Portal. The next milestone is item wise indigenisation within the notified timeframes, with the outer deadlines running to December 2031, after which the listed items may be procured only from Indian industry.

  • Rotating detonation engines: the science and the promises

    Why in the News

    An India based defence startup announced that it had successfully demonstrated a rotating detonation engine (RDE) at a Defence Research and Development Organisation (DRDO) facility in Hyderabad. The physics of the design has been understood since the 1960s, and the binding constraint has never been the theory but the materials, computing and diagnostics needed to hold a continuous supersonic detonation inside a compact chamber. Despite a global cluster of tests and funding rounds in 2026, no model is known to be ready for commercial or military use anywhere.

    What is a rotating detonation engine (RDE)?

    1. What it is: An engine design in which combustion happens as a continuous detonation travelling in a circle inside a ring shaped chamber, rather than as a flame front sweeping through a cylinder.
    2. Its promise: It uses fuel more efficiently than conventional rocket engines, so the same task needs correspondingly less fuel.
    3. Why the saving matters: Launching satellites and carrying explosives to distant targets are both expensive, and fuel saved can be passed to the payload, whether a satellite or a warhead.
    4. The efficiency figure: Going by physics alone, RDEs offer around 10 per cent to 25 per cent more thermodynamic efficiency than conventional combustors, with the exact value depending on real world conditions and engine design.
    5. What it produces: It can continuously generate thrust, or mechanical energy if coupled to a piston.
    6. Its current state: RDEs are confined to research and development, and there are no models known to be ready for commercial or military use.

    What is deflagration?

    1. What it is: Combustion in which a flame introduced into a fuel and air mixture travels through that mixture at less than the speed of sound.
    2. What it does thermodynamically: The combustion happens at constant pressure, because the mixture is free to expand as it heats up instead of being confined under pressure.

    What is detonation?

    1. What it is: Combustion in which the flame travels through the mixture at more than the speed of sound, imposing a shock wave on the mixture and heating it, which triggers rapid combustion behind the wave.
    2. What it does thermodynamically: The combustion happens at constant volume, because the shock wave compresses the unburned mixture immediately before combustion and the mixture has no time to expand.

    What is a pulsed detonation engine (PDE)?

    1. What it is: The simplest type of detonation engine, using a long tube as the combustion chamber so a detonation can pass through the whole mixture.
    2. Its cycle: The detonation races down the tube, compressing and burning the fuel and air mixture, and the hot high pressure products expand out of the open end at high speed. The tube is then purged before the next cycle begins.

    What is an annular combustor?

    1. What it is: A combustion chamber shaped as two concentric cylinders with a narrow ring shaped gap between them, the gap being called the annulus.
    2. Why the RDE uses it: The annulus gives the detonation wave a closed circular path to travel, which is what converts a one shot detonation into a continuous one.

    What is thermodynamic efficiency?

    1. What it measures: How much of a fuel’s chemical energy becomes useful work rather than being shed as waste heat.
    2. What a gain translates into: An RDE that improves thermodynamic efficiency by 20 per cent could theoretically require around 17 per cent less fuel for the same output, assuming other losses are unchanged.

    Why does detonation deliver more efficiency than deflagration?

    1. The regular engine case: A spark plug introduces a flame into the fuel and air mixture in the combustion chamber, and it travels through at subsonic speed.
    2. The expansion difference: In deflagration the mixture expands freely as it heats, so combustion proceeds at constant pressure.
    3. The compression difference: In detonation the shock wave compresses the unburned mixture just before it burns, so combustion proceeds at constant volume.
    4. The pressure outcome: A detonation engine therefore produces combustion products at a higher pressure.
    5. The energy conversion: More of the fuel’s chemical energy is converted into pressure rather than being shed as heat, and that is the entire basis of the fuel efficiency claim.
    6. The comparison held constant: The advantage holds for a detonation engine against a regular engine burning the same fuel.

    How does an RDE sustain a continuous detonation?

    1. The design choice: Instead of the detonation passing through a long tube once, it is made to flow in a circle.
    2. The chamber: The combustion chamber has an annular shape, and fuel and oxidiser are injected continuously into the ring shaped gap.
    3. The wave: One or more detonation waves race through the annulus while injection continues.
    4. The timing requirement: Fuel is injected into the annulus just ahead of the detonation wave, so the wave always meets fresh mixture.
    5. The exhaust: The wave consumes the fresh fuel and air mixture and expels the products through the nozzle along its axis.
    6. The rate: As long as fuel keeps arriving at the right time and in the right condition, the detonation can keep going even at thousands of times per second.
    7. The output: By Newton’s third law the momentum of the expelled gases produces an equal and opposite momentum on the engine, which is what generates thrust.

    Who is developing rotating detonation engines and with what funding?

    1. D-Propulse, India: The India based defence startup that recently announced a successful RDE demonstration at a DRDO facility in Hyderabad.
    2. NASA, United States: Ran a full scale RDE test in 2023 in which the engine fired for 251 seconds, a record at the time.
    3. GE Aerospace and Lockheed Martin: Demonstrated an RDE for hypersonic missiles in January, using air drawn from the atmosphere.
    4. SpaceWorks, United States: Reported hot fire tests of its RDE for rockets in February.
    5. Astrobotic, United States: Test fired its Chakram RDE continuously for 300 seconds.
    6. L3Harris, United States: Announced that it had tested two RDEs, in April and May respectively.
    7. Stellar Alpina, Switzerland: Completed a commercial RDE hot fire test and raised CHF 3.5 million.
    8. Juno Propulsion: Raised $1.4 million to develop an RDE for spacecraft thrusters.
    9. Venus Aerospace, United States: Raised $91 million in July to scale its tested RDE, then partnered with Lockheed Martin.
    10. What the roster shows: Activity is concentrated in the United States and in venture funded startups, and it spans rockets, hypersonic missiles and spacecraft thrusters rather than a single application.

    Why was a 1960s concept only testable now?

    1. The theory was settled early: Scientists worked out how an RDE could function by the 1960s, and building one was a different matter.
    2. Injection and pressure control: Sustaining a continuous detonation in a compact chamber requires engineers to precisely control fuel injection and internal pressure.
    3. Chamber geometry: The chamber needs a specific geometry for the engine to work as intended.
    4. Instability sensitivity: Unlike in regular engines, even small instabilities in the fuel and air mixture can destabilise an RDE.
    5. Temperature threshold: Engine materials must withstand more than 2,000 degrees Celsius.
    6. Pressure threshold: Materials must survive 10 to 100 atmospheres of pressure, and much higher in brief moments.
    7. Speed threshold: Detonation speeds exceed 1,500 m/s.
    8. Oscillation and loading: Pressures oscillate at several thousand cycles per second, and the structure sees potentially tens to hundreds of g depending on the design.
    9. What had to arrive first: Working RDEs required advances in high speed computing, diagnostics, fuel injection, materials and manufacturing.

    Why does the efficiency gain matter for launch and strike systems?

    1. Cost of access to space: Launching satellites on rockets is expensive, and fuel is a dominant share of the launch mass.
    2. Cost of long range strike: Carrying explosives to distant targets on missiles is equally expensive on the same fuel logic.
    3. The trade converted: Less fuel for the same task means more mass available for payload.
    4. Commercial consequence: Passing that saving to the satellite or warhead increases the profitability of the mission.
    5. Why launch benefits most: The gain is considered significant specifically for rocket launches, where the fuel to payload ratio is most punishing.
    6. The air breathing variant: For hypersonic missiles the engine draws oxidiser from the atmosphere, which removes the need to carry it.

    Why does a settled physics advantage still have no deployable engine?

    1. The stated status: RDEs remain confined to research and development, with no models known to be ready for commercial or military use.
    2. The evidence gap: Actual data from many tests by commercial entities are not available in the public domain.
    3. What the efficiency claim rests on: The 10 per cent to 25 per cent figure is derived from physics alone, not from fielded performance.
    4. The qualification the source itself attaches: The saving that can be passed to the payload holds at least on paper.
    5. Where the difficulty sits: The obstacle is not the thermodynamics but the survivability of materials and the controllability of the detonation.
    6. The demonstration versus product gap: A successful hot fire test proves the wave can be sustained, and it does not prove an engine can be throttled, restarted, integrated and qualified for flight.
    7. The funding signal: Capital is arriving before a product exists, which is a bet on the remaining engineering rather than a proof that it is solved.

    Challenges to rotating detonation engine development

    1. Material survivability under cyclic thermal load: Wall materials face more than 2,000 degrees Celsius and pressure oscillations of several thousand cycles per second, which drives fatigue cracking. e.g. regeneratively cooled chamber liners in conventional engines already fail at far lower thermal cycling rates.
    2. Detonation wave instability: Wave count, direction and mode can shift during a run, which changes thrust unpredictably. e.g. test campaigns commonly report transitions between single wave and multiple wave modes in the same firing.
    3. Injector design and mixing: Fuel and oxidiser must mix fully in the microseconds before the wave arrives, and incomplete mixing quenches the detonation. e.g. deflagration to detonation transition failures reported in early pulsed detonation engine work.
    4. Nozzle matching: The exhaust leaves the annulus with a rotating, unsteady pressure field that a conventional bell nozzle is not designed for. e.g. aerospike and plug nozzle concepts are being revisited specifically for detonation exhausts.
    5. Absence of validated test data: Commercial developers do not release performance data, so independent verification of efficiency claims is not possible. e.g. the hot fire results announced by several firms in 2026 carry no published specific impulse figures.
    6. Qualification and certification burden: Flight qualification requires demonstrated restart, throttling and life cycle margins that no RDE has yet shown. e.g. human rated engines must clear multiple full duration firings with margin, a standard the 251 second NASA record does not yet meet.
    7. Dual use export control: Detonation propulsion for hypersonic applications falls within missile technology control regimes, which restricts collaboration. e.g. Missile Technology Control Regime Category I restrictions on complete rocket systems and their major subsystems.
    8. Manufacturing tolerance: The annulus gap must be held to fine tolerance across a hot, deforming structure, which requires additive manufacturing at aerospace grade. e.g. additive manufactured combustion chambers have to be qualified for porosity and residual stress before flight use.
    9. Talent and facility scarcity: Very few facilities can instrument a detonation at these speeds and pressures. e.g. high speed schlieren and pressure diagnostics capable of resolving events at several thousand cycles per second exist in a handful of laboratories.

    Conclusion

    The rotating detonation engine’s advantage is a settled point of physics: replacing constant pressure deflagration with constant volume detonation converts more chemical energy into pressure instead of shedding it as heat, and that is worth roughly 10 per cent to 25 per cent in thermodynamic efficiency. What remains unsolved is entirely an engineering problem of materials, wave control and diagnostics, which is why a design understood in the 1960s still has no commercially or militarily ready model anywhere. The Hyderabad demonstration places India inside the small group attempting that engineering, and a demonstration is not yet a qualified engine.

    “[2026] Consider the following statements about involvement of private entities in India’s space programme:
    1. IN-SPACe is an autonomous agency formed to facilitate participation of private entities.
    2. Agnikul Cosmos launched the world’s first flight using 3D-printed rocket engine.
    3. Skyroot Aerospace has developed liquid fuel for GSLV.
    (a) 1 only
    (b) 2 and 3 only
    (c) 1 and 2 only
    (d) 1, 2 and 3

  • NASA invites ISRO to join its mission for lunar outpost

    Why in the News:

    The National Aeronautics and Space Administration (NASA) has invited the Indian Space Research Organisation (ISRO) to join its Moon Base programme, the effort to return humans to the Moon and set up a permanent settlement near the lunar South Pole. The invitation was extended at the ninth meeting of the India and United States Civil Space Joint Working Group, deepening a partnership that already spans the Artemis Accords and a joint radar satellite.

    What was announced and what is the Moon Base programme?

    1. The invitation: NASA invited ISRO to join its Moon Base programme, building on the two countries’ partnership under the Artemis Accords.
    2. The venue: The offer was made at the ninth meeting of the India and United States Civil Space Joint Working Group, held in Bengaluru on 5 and 6 August.
    3. The programme: The Moon Base programme aims to establish humanity’s first outpost on another celestial body, near the South Pole of the Moon.
    4. Wider setting: The meeting advanced civil and commercial space cooperation under a strategic technology initiative aligned with the February 2025 Joint Leaders’ Statement.

    What are the Artemis Accords?

    1. Definition: The Artemis Accords are a United States led set of non binding principles to govern the peaceful civil exploration and use of outer space, including the Moon.
    2. India’s role: India signed the Accords in 2023 as the 27th country, and a total of 70 countries are now part of them.
    3. Relevance: The Moon Base invitation and agreed open scientific data sharing are being pursued under this framework.

    What deepening ties does the invitation reflect?

    1. NISAR mission: The two agencies last year launched the NASA and ISRO Synthetic Aperture Radar (NISAR) mission, a dual frequency radar satellite and a first of its kind joint venture.
    2. Human spaceflight: An Indian astronaut flew to the International Space Station in 2025 through an Axiom mission, a result of a strategic framework for human spaceflight cooperation.
    3. Data cooperation: Both sides agreed to advance open scientific data sharing and discussed joint missions to the Moon and beyond.
    4. Outer space governance: They reaffirmed commitment to United Nations guidelines on the long term sustainability of outer space activities.

    What are India’s own lunar and human spaceflight programmes?

    1. Gaganyaan: ISRO is pursuing its human spaceflight programme to send Indian astronauts to low Earth orbit.
    2. Moon landing target: India has stated plans to achieve a human landing on the Moon by 2040.
    3. Chandrayaan legacy: India’s earlier lunar missions established its capability, including a South Pole region landing.
    4. Complementary strengths: NISAR’s success is seen as a base for more complex joint missions, including the lunar base and human spaceflight.

    Back2Basics: NISAR Mission

    1. Full form: NASA and ISRO Synthetic Aperture Radar mission.
    2. Nature: A joint Earth observation satellite using dual frequency radar, a first of its kind.
    3. Purpose: Monitors changes in land surface, ice sheets, ecosystems and natural hazards.
    4. Significance: Regarded as a landmark joint venture that could enable more complex India and United States space missions.

    Government Initiatives / Programmes in Indian Space

    1. Gaganyaan: India’s human spaceflight programme to send astronauts to low Earth orbit.
    2. Chandrayaan Programme: Series of lunar missions advancing India’s Moon exploration.
    3. IN-SPACe: Regulator and promoter enabling private sector participation in space.
    4. Indian Space Policy 2023: Framework opening the sector to non governmental entities.

    Key Facts about India and Global Space Cooperation

    1. Artemis signatory: India was the 27th country to sign the Artemis Accords in 2023, now numbering 70 countries.
    2. Working group: The invitation came at the ninth India and United States Civil Space Joint Working Group in Bengaluru.
    3. Moon landing goal: India targets a human landing on the Moon by 2040.
    4. South Pole focus: The Moon Base aims for humanity’s first outpost near the lunar South Pole.

    “[2016] Consider the following statements: The Mangalyaan launched by ISRO

    1. is also called the Mars Orbiter Mission

    2. made India the second country to have a spacecraft orbit the Mars after USA

    3. made India the only country to be successful in making its spacecraft orbit the Mars in its very first attempt

    Which of the statements given above is/are correct?

    (a) 1 only

    (b) 2 and 3 only

    (c) 1 and 3 only

    (d) 1, 2 and 3

  • BioE3 Policy Reports Early Biomanufacturing Gains

    Why in the News

    The Government has highlighted the early achievements of the Biotechnology for Economy, Environment and Employment (BioE3) Policy, demonstrating growing investments and capacity in India’s biomanufacturing sector.

    What is the BioE3 Policy?

    • Full form: Biotechnology for Economy, Environment and Employment (BioE3) Policy.
    • Approved: 2024 by the Union Cabinet.
    • Implementing Agency: Department of Biotechnology (DBT).
    • Objective: Promote high capacity biomanufacturing to drive economic growth, environmental sustainability, and employment generation.

    Key Features of the Policy

    • Focus Areas: The policy identifies six thematic sectors:
      • Bio based chemicals.
      • Smart proteins.
      • Precision biotherapeutics.
      • Climate resilient agriculture.
      • Biofuels and carbon capture.
      • Marine and space biotechnology.
    • Funding Pattern:
      • Government support of up to 70% of project cost.
      • Remaining contribution from the private sector.
    • Industry Participation:
      • Over 600 beneficiaries have utilised BioE3 facilities.
      • Private investment commitments have reached about ₹602 crore.
    • Long term Goal: Support India’s vision of a $300 billion bioeconomy by 2030.

    What is Biomanufacturing?

    • Definition: The production of chemicals, fuels, materials, pharmaceuticals and other products using biological systems such as microorganisms, enzymes or engineered cells.
    • Benefits:
      • Reduces dependence on fossil fuel based manufacturing.
      • Promotes sustainable industrial production.
      • Supports the circular bioeconomy.

    What is a Biofoundry?

    • A highly automated research facility that designs, builds, tests and analyses biological systems.
    • Accelerates the development of new biotechnology products through automation and artificial intelligence.

    [2026] Which of the following statements with regard to GenomeIndia Project is/are correct ?
    1. It is a part of the Human Genome Project.
    2. The project is funded by the Department of Biotechnology (DBT), Government of India.
    3. Its primary aim is to build a catalogue of genetic diversity of the Indian population.
    Select the answer using the code given below:

    [A] 1 only

    [B] 2 and 3 only

    [C] 1 and 2 only

    [D] 1, 2 and 3

  • ISRO and Japanese scientists review mission Chandrayaan 5 preparation

    Why in the News?

    An ISRO–JAXA delegation reviewed preparations for Chandrayaan-5 (LUPEX), India’s joint lunar mission with Japan, targeted for 2028. ISRO also informed Parliament that the Crew and Service Modules for the Gaganyaan-1 uncrewed mission are nearing completion.

    What is Chandrayaan-5 (LUPEX)?

    • Full Name: Lunar Polar Exploration Mission (LUPEX).
    • A joint lunar mission of ISRO and JAXA.
    • Target Launch: 2028.
    • Objective: Explore and study water and water ice at the Moon’s south polar region.

    Mission Components

    • Lander: Developed by ISRO.
    • Rover: Developed by JAXA.
    • Launch Vehicle: Japan’s H3 Rocket.
    • Scientific Payloads:
      • NASA: Neutron Spectrometer.
      • ESA: Mass Spectrometer.
    • Mission Duration: Around 100 days.
    • Scientific Instruments: 7 across the lander and rover.

    Mission Objectives

    • Detect and analyse surface and subsurface water ice.
    • Study the lunar south pole.
    • Support future human lunar exploration and resource utilisation.

    What is the status of Gaganyaan-1?

    • Gaganyaan-1 is an uncrewed precursor mission.
    • Crew and Service Modules are in the final stages of assembly and testing.
    • Intended to validate: Crew Module, Service Module, Crew Escape System, Life Support Systems
    • Launch has been delayed, and a revised schedule is yet to be announced.

    Significance

    • Strengthens India–Japan space cooperation.
    • Demonstrates multi-agency collaboration involving ISRO, JAXA, NASA, and ESA.
    • Advances lunar science and technologies for future exploration.
    • Supports India’s long-term human spaceflight ambitions under Gaganyaan.

    Challenges

    • Budget and resource constraints across multiple space missions.
    • Integration of ISRO’s lander with JAXA’s rover.
    • Dependence on Japan’s H3 launch vehicle.
    • Delays in the Gaganyaan programme.

    Chandrayaan Missions

    • Chandrayaan-1 (2008): Confirmed the presence of water molecules on the Moon.
    • Chandrayaan-2 (2019): Orbiter remains operational; lander hard-landed.
    • Chandrayaan-3 (2023): India became the first country to achieve a soft landing near the lunar south pole.
    • Chandrayaan-4: Planned Indian mission for lunar sample return.
    • Chandrayaan-5 (LUPEX): Joint ISRO–JAXA mission to explore lunar polar water ice.

    Gaganyaan Programme

    • India’s first human spaceflight mission.
    • Objective: Demonstrate the capability to send Indian astronauts to Low Earth Orbit (LEO) and return them safely.
    • Implemented by ISRO.

    ISRO’s Major International Collaborations

    • JAXA: Chandrayaan-5 (LUPEX).
    • NASA: NISAR mission and Chandrayaan payloads.
    • ESA: Scientific payloads and deep-space support.

    [2025] Consider the following space missions:
    I. Axiom-4
    II. SpaDeX
    III. Gaganyaan
    How many of the space missions given above encourage and support microgravity research?

    [A] Only one

    [B] Only two

    [C] All the three

    [D] None

  • ISRO’s NavIC System Can No Longer Provide Standalone Navigation Services

    Why in the News?

    For the first time, the Government has admitted in Parliament that India’s NavIC (Navigation with Indian Constellation) cannot currently provide standalone positioning services, as only 3 operational satellites are available for navigation, while at least 4 satellites are required.

    What is the issue?

    • IRNSS-1F, launched in March 2016, completed its mission life and its onboard atomic clock failed, reducing the operational navigation satellites.
    • At present, only IRNSS-1B, IRNSS-1I, and NVS-01 are providing Positioning, Navigation and Timing (PNT) services.
    • As a result, NavIC cannot independently provide positioning services, though its timing service remains functional.

    What is NavIC?

    • NavIC (Navigation with Indian Constellation) is India’s regional satellite navigation system, developed by ISRO under the Indian Regional Navigation Satellite System (IRNSS).
    • It provides Positioning, Navigation and Timing (PNT) services over:
      • India, and
      • up to 1,500 km beyond its borders.
    • The original constellation was designed with 7 satellites.

    Why are four satellites necessary?

    • A navigation receiver determines its position through trilateration.
    • At least 4 satellites are required to accurately calculate Latitude, Longitude, Altitude, and Time correction
    • Without four operational satellites, standalone navigation becomes unreliable.

    Does this affect users?

    • No major impact on most users.
    • Smartphones, aircraft, ships and vehicles use multi-constellation GNSS receivers, combining signals from GPS (USA), Galileo (European Union), GLONASS (Russia), BeiDou (China), and NavIC (India)
    • Hence, navigation services continue without significant disruption.

    Current status

    • Standalone positioning: Not available.
    • Timing service: Functional.
    • Emergency message broadcasting: Functional.
    • Armed Forces: Continue using NavIC as part of a multi-constellation GNSS framework.

    Future roadmap

    • NVS-03 is ready for launch.
    • NVS-04 and NVS-05 are in advanced stages of development.
    • These satellites are expected to restore NavIC’s independent navigation capability.

    Significance of NavIC

    • Enhances strategic autonomy by reducing dependence on foreign navigation systems.
    • Supports: Defence operations, Disaster management, Maritime navigation, Aviation, Railways, Road transport, Precision agriculture, and Surveying and mapping
    • Provides secure and reliable navigation during emergencies or geopolitical conflicts.

    [2023] Which one of the following countries has its own Satellite Navigation System?

    [A] Australia

    [B] Canada

    [C] Israel

    [D] Japan

  • Celebrating 25 Years of the Himalayan Chandra Telescope (HCT)

    Why in News?

    The Himalayan Chandra Telescope (HCT) at Hanle, Ladakh, completed 25 years of operation. The occasion was marked by a conference highlighting its scientific achievements and future expansion plans.

    Key Highlights

    • Location: Indian Astronomical Observatory (IAO), Hanle, Ladakh (4,517 m).
    • Managed by: Indian Institute of Astrophysics (IIA) under the Department of Science and Technology (DST).
    • First Light: 26 September 2000; dedicated to the nation in 2001.
    • Named after Subrahmanyan Chandrasekhar.
    • Operated remotely from Bengaluru via INSAT-3B since 2001.

    Why is Hanle Important?

    • Over 250 clear nights annually.
    • Very low atmospheric water vapour and minimal light pollution.
    • Ideal for optical and near-infrared astronomy.
    • Protected under the Hanle Dark Sky Reserve.

    Major Scientific Contributions

    • Studies of gamma-ray bursts, comets, exoplanets, supernovae, variable stars, galaxies, and active galactic nuclei (AGN).
    • Contributed to the discovery of TRAPPIST-1b.

    Key Instruments

    • HFOSC – Optical camera and spectrograph.
    • uTIRSPEC – Near-infrared spectrometer.
    • HESP – High-resolution Echelle spectrograph.

    Future Plans

    The Union Budget announced:

    • 3.7-m Upgraded Himalayan Chandra Telescope (UHCT).
    • 13.7-m National Large Optical-Infrared Telescope (NLOT) at Hanle.

    Prelims Facts

    • HCT: 2-m optical telescope at Hanle, Ladakh.
    • Nodal Agency: Indian Institute of Astrophysics (IIA).
    • Administrative Ministry: Department of Science and Technology (DST).
    • Hanle Dark Sky Reserve: India’s first Dark Sky Reserve.

    [2016] With reference to ‘Astrosat’,’ the astronomical observatory launched by India, which of the following statements is/are correct?
    1. Other than USA and Russia, India is the only country to have launched a similar observatory into space.
    2. Astrosat is a 2000 kg satellite placed in an orbit at 1650 km above the surface of the Earth.
    Select the correct answer using the code given below.

    [A] 1 only

    [B] 2 only

    [C] Both 1 and 2

    [D] Neither 1 nor 2

  • DRDO Successfully Flight Tests Indigenous Long-Range SAM ‘Kusha’

    Why in News?

    The Defence Research and Development Organisation (DRDO) successfully conducted the maiden flight test of the indigenous Long-Range Surface-to-Air Missile (LR-SAM) ‘Kusha’ from APJ Abdul Kalam Island, Odisha.

    What is Project Kusha?

    • An indigenous Long-Range Surface-to-Air Missile (LR-SAM) system developed by DRDO.
    • Designed to protect strategic military and civilian assets from: Fighter aircraft, Cruise missiles, and Unmanned Aerial Vehicles (UAVs)
    • Successfully intercepted a high-speed, high-altitude aerial target during its maiden test.

    Key Highlights

    • Long-range SAMs generally have a range of over 200 km.
    • Developed with indigenous missiles, radars, and command & control systems.
    • Will reduce India’s dependence on imported long-range air defence systems.

    Mission Sudarshan Chakra

    • Proposed indigenous multi-layered national air defence shield.
    • Project Kusha and the Integrated Air Defence Weapon System (IADWS) are its key components.
    • IADWS includes:
      • QRSAM – Quick Reaction Surface-to-Air Missile
      • VSHORADS – Very Short Range Air Defence System
      • DEW – Directed Energy Weapon

    Prelims Value Added

    • DRDO: Defence Research and Development Organisation.
    • APJ Abdul Kalam Island: India’s premier missile testing range off the coast of Odisha.
    • SAM: Surface-to-Air Missile designed to intercept aerial threats.

    [2026] Consider the following statements about Mission Sudarshan Chakra of India :
    1.It aims to enhance India’s air defence and aerial offensive capabilities.
    2.This Mission is being designed to enhance rapid, precise, and powerful defence responses, reinforcing India’s strategic autonomy.
    3.One of the aims of this Mission is to cover all public places od India by an expanded nationwide shield by 2035.
    Which of the statements given above is/are correct ?

    [A] 1,2 and 2

    [B] 1 and 2 only

    [C] 2 and 3 only

    [D] 1 only

  • Making Sense of Embodied AI: The Next Frontier in Robotics

    Why in the News?

    On April 14, Boston Dynamics and Google DeepMind gave Spot, a robot dog long confined to scripted routines, an AI brain (Gemini Robotics-ER 1.6). This revived global interest in “embodied AI” as robots moved from labs into real-world settings such as the FIFA World Cup 2026 football field and America’s Got Talent. This has sharpened the debate over whether robotic intelligence is fundamentally a software problem or one rooted in the physical body itself.

    What does ’embodied AI’ actually mean, and why is intelligence not just software placed in a robot body?

    1. Definition: Embodied AI is a paradigm of artificial intelligence where algorithms are integrated into physical systems (such as humanoid robots, robotic arms, and autonomous vehicles) to perceive, learn from, and interact with the physical world through sensory motor control.
    2. Body as computation, not container: Researchers argue a robot’s body is not merely a delivery mechanism for intelligence but part of the computation itself. This claim is advanced by Rolf Pfeifer (Zurich) and Josh Bongard (Vermont) in How the Body Shapes the Way We Think.
    3. Subsumption architecture: Rodney Brooks showed in the late 1980s-90s that layered reflexes coupled directly to sensors and motors can produce robust real-time behaviour without any internal world-model. This challenged the dominant symbolic-AI paradigm of the time.
    4. Morphological computation: Physical body structure offloads work that would otherwise require a brain. A passive-dynamic walker descends a slope using only leg geometry, with no motors or control system.
    5. Adaptive material design: A soft, compliant robotic hand grips oddly shaped objects without an explicit shape model, because the material itself deforms and adapts.
    6. Common thread: Across Pfeifer’s lab, Brooks’s robots, and today’s humanoids, intelligence is distributed between brain, body, and environment, not confined to one part.

    Why does mastering the physical world remain far harder for AI than mastering language and images?

    1. Different learning problem: Unlike chatbots trained on text, images, and video, embodied AI must master gravity and balance across countless physical scenarios a robot may face.
    2. Simulation-to-real gap: Success in simulation rarely translates perfectly to the real world, since simulated environments cannot capture every physical contingency.
    3. Market-performance mismatch: The embodied AI market is projected to reach $23 billion by 2030, yet most humanoid robots still run only about 90 minutes on a charge.
    4. Lab-to-field performance drop: Policies that succeed 95% of the time in the lab drop to roughly 60% in the real world.
    5. Central bottleneck: The gap between demo and deployment remains the field’s unglamorous but defining problem.

    How does embodied AI differ from neuromorphic AI, despite both drawing on biology?

    1. Different questions: Embodied AI asks where intelligence lives, treating cognition as distributed across brain and body; neuromorphic AI asks how the processor itself is built.
    2. Hardware-agnostic: Embodied AI is largely indifferent to processor type; a robot’s “brain” can run on an ordinary GPU cluster.
    3. Spiking neural networks (SNNs): Neuromorphic AI most commonly uses SNNs, where each neuron fires only once incoming signals cross a threshold, suiting time-sensitive tasks like motion sensing.
    4. Power efficiency: Neuromorphic chips consume energy only when neurons are actively spiking, making them notably power-efficient.
    5. Convergence in practice: A growing body of research on “embodied neuromorphic intelligence” places spiking, event-driven chips inside physical robots specifically for their low power draw and fast response.

    How can co-designing body and brain through evolutionary computation address the body-task mismatch?

    1. The design question: If bodies perform computation, the right approach is to design the body for the task, rather than bolting an AI model onto whatever frame engineers have already built.
    2. Jin’s argument: Yaochu Jin, Alexander von Humboldt Professor at Bielefeld University, holds that neural control and physical form must be developed together, not designed separately and combined.
    3. Biological parallel: This mirrors how biological organisms grow nervous systems and bodies in tandem, shaped by continuous environmental feedback.
    4. Research focus: Jin’s work centres on co-evolving nervous systems and morphology, and on how environmental feedback shapes an organism’s sensory distribution.
    5. Practical payoff: Evolutionary computation lets simulated robot populations compete and replicate based on task performance before any physical prototype is built, addressing the costly, slow problem of manually re-engineering hardware whenever a task changes.

    Why is embodied AI a systems challenge that no single breakthrough can resolve?

    1. Persistent sim-to-real gap: Policies trained cheaply in simulation, run millions of times over, still degrade sharply once deployed on real hardware.
    2. Speed-reflex mismatch: Reasoning models are often too slow for robot limbs that must react in milliseconds, forcing a split between heavy “thinking” done off-device and lighter reflexive control on the robot itself.
    3. Hardware fragility: Short battery runtimes and vulnerable components undercut otherwise successful pilots.
    4. Data scarcity: Embodied systems lack an internet-scale training corpus. The Open X-Embodiment dataset and Generalist AI’s GEN-0 are early attempts to build one, but real-world deployment needs at least tens of millions of hours of training data.
    5. A systems problem, not just a software one: Safe deployment depends on sensors, hardware robustness, operational design limits, human interaction, cybersecurity, and organisational processes, not algorithms alone. Regulators must define evidentiary standards for deploying learning-enabled robots.
    6. Form factor as evidence: Boston Dynamics’ Atlas adapting to uneven turf at the FIFA World Cup 2026, and China’s Unitree G1 robots performing alongside professional dancer Wu Yufei on America’s Got Talent Season 21, show gains coming as much from redesigned quadruped and avian-inspired forms as from smarter software.

    Conclusion

    Embodied AI reframes robotic intelligence as something distributed across brain, body, and environment, not a software layer simply installed onto hardware. Progress is bottlenecked not by algorithmic sophistication but by physical constraints, the simulation-to-real gap, data scarcity, actuation-speed mismatches, and bodies poorly matched to their tasks. Closing this gap requires treating embodied AI as a systems-engineering and regulatory challenge, including the evolutionary co-design of body and brain, rather than a problem that better software alone can solve.

    PYQ Relevance

    [UPSC 2015] What are the areas of prohibitive labour that can be sustainably managed by robots ? Discuss the initiatives that can propel research in premier research institutes for substantive and gainful innovation.

    Linkage: The PYQ asks what areas of prohibitive labour can be sustainably managed by robots, and what initiatives can propel research in premier institutes for gainful innovation. It connects to the article’s broader theme of advancing robotics research.