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GS Paper: GS3

  • Discovery of Rare Quadruple Star System with Brown Dwarfs

    Why in the News?

    Scientists have identified UPM J1040−3551 AabBab, a rare quadruple star system with two brown dwarfs orbiting two red dwarfs.

    Discovery of Rare Quadruple Star System with Brown Dwarfs

    About UPM J1040−3551 AabBab:

    • Overview: Newly discovered quadruple star system in the Milky Way.
    • Composition: Two cold T-type brown dwarfs orbiting a pair of young red dwarf stars.
    • Uniqueness: First known system of its kind; extremely rare as brown dwarfs usually exist alone, with less than 5% chance of companions.
    • Significance: Offers new insights into the formation and evolution of low-mass stars and sub-stellar objects.

    What are Brown Dwarfs?

    • Overview: Celestial objects between stars and planets in characteristics.
    • Formation: Form like stars from collapsing gas and dust but lack sufficient mass for sustained hydrogen fusion.
    • Nickname: Often called “failed stars” due to absence of sustained nuclear fusion.
    • Mass Range: Can reach up to about 70 times the mass of Jupiter.
    • Atmosphere: Similar to gas giants like Jupiter and Saturn, with molecules and water vapor clouds.
    • Detection: Very faint and cold; usually identified in multiple-star systems where brighter stars help estimate their properties.
    • Astronomical Importance: Help define the boundary between stars and planets; provide clues to conditions necessary for stellar and planetary formation.
    • Cosmological Role: Studying their abundance and distribution aids in understanding mass distribution in the universe and connections to dark matter.
    [UPSC 2024] Consider the following statements:

    Statement-I: Giant stars live much longer than dwarf stars.

    Statement-II: Compared to dwarf stars, giant stars have a greater rate of nuclear reactions.

    Which one of the following is correct in respect of the above statements?

    Options: (a) Both Statement-I and Statement-II are correct and Statement-II explains Statement-I

    (b) Both Statement-I and Statement-II are correct, but Statement-II does not explain Statement-I

    (c) Statement-I is correct, but Statement-II is incorrect

    (d) Statement-I is incorrect, but Statement-II is correct*

     

  • First Human Case of New World Screwworm in US

    Why in the News?

    The US authorities have reported the first human case of the flesh-eating parasite, the New World screwworm.

    About New World Screwworm (Cochliomyia hominivorax):

    • Overview: Called “man-eater” larvae in Latin; South America and the Caribbean.
    • Larval Stage: Eggs hatch into maggots that burrow into wounds of warm-blooded animals (including humans) and feed on living flesh in a screw-like motion.
    • Life Cycle: After feeding, larvae fall to soil, pupate, and emerge as adult Blue-grey blowfly.
    • Human Infestation (Myiasis): Causes painful non-healing wounds, bleeding, foul odour, sensation of movement; may lead to sepsis or death if untreated.
    • Eradication in USA: Eliminated in 1966 using Sterile Insect Technique (SIT) by mass release of sterile males.

    Current Spread and Concerns:

    • Recent Outbreaks: Detected in Panama, Costa Rica, Nicaragua, and Honduras.
    • Cause of Spread: Likely linked to movement of infested cattle across regions.
    • Possible Weakness in SIT: Current strain of sterilized flies may be less effective than earlier strains.
    • New Human Case: First travel-associated screwworm myiasis reported in the United States in 2025.
    • Livestock Threat: Serious danger to cattle industry; risk of animal suffering and economic loss.
    • Biosecurity Risk: Reemergence could undo decades of eradication efforts if uncontrolled.
    [UPSC 2017] Consider the following statements:

    1. In tropical regions, Zika virus disease is transmitted by the same mosquito that transmits dengue.

    2. Sexual transmission of Zika virus disease is possible.

    Which of the statements given above is/are correct?

    Options: (a) 1 only (b) 2 only (c) Both 1 and 2* (d) Neither 1 nor 2

     

  • What is the Air Drop Test (ADT-1) conducted by ISRO?

    Why in the News?

    ISRO has successfully conducted IADT-1, a key milestone for India’s maiden human spaceflight mission, Gaganyaan.

    What is the Air Drop Test (ADT-1) conducted by ISRO?

    About Air Drop Test (ADT-1):

    • Test Setup: A dummy crew module weighing nearly 5 tonnes was dropped from an Indian Air Force Chinook helicopter at an altitude of about 3 km.
    • Purpose: To test the parachute-based deceleration system that will slow the crew module during re-entry and ensure a safe splashdown.
    • Parachute Sequence: Parachutes deployed in order — first drogue chutes, followed by three main parachutes — slowing the capsule to about 8 metres per second before landing.
    • Outcome: The touchdown matched expectations, successfully validating the design for human re-entry and landing.

    Roadmap for Gaganyaan:

    • Objective: The ultimate goal is to send Indian astronauts to low-earth orbit on a human-rated LVM3 rocket.
    • Validation Tests: A series of safety validation tests are planned before the crewed mission.
    • Crew Escape System (CES): Already tested with TV-D1 in October 2023; TV-D2 will demonstrate a more complex abort scenario.
    • First Uncrewed Mission (G1): Will carry the humanoid robot Vyommitra to simulate astronaut operations.
    • Parallel Trials: Multiple air drop tests and subsystem validations, including parachute trials and life-support system checks, will continue.
    • Key Technologies: Critical systems under development include the Environmental Control and Life Support System (ECLSS), the Integrated Vehicle Health Management System (IVHMS), and a strengthened human-rated LVM3 rocket.
    • Timeline: The first human spaceflight (H1) is currently targeted for 2027, though delays are possible due to complexity in human-rating systems.

    Long-term Goals:

    • Foundation: Gaganyaan marks the beginning of India’s long-term human spaceflight programme.
    • Space Station: The GoI has announced the Bharatiya Antariksh Station (BAS) to be established by 2035.
    • Lunar Mission: India aims to achieve a crewed lunar landing by 2040.
    • Critical Technologies: Capabilities such as in-orbit docking, demonstrated by the SpaDeX mission in 2025, will be essential for future missions.
    [UPSC 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?

    Options:

    (a) Only one (b) Only two (c) All the three* (d) None

     

  • Exercise Maitree

    Why in the News?

    The 14th Maitree Exercise between Indian and Thai Army will be held in Umroi, Meghalaya returning to India after five years.

    About Exercise Maitree:

    • Overview: A bilateral military exercise between the Indian Army and the Royal Thai Army.
    • Started: 2006, as a collaborative initiative to deepen defense ties.
    • Frequency: Held annually, alternating between India and Thailand.
    • Participants: Company-level contingents (approx. 70–80 soldiers each); Indian units have included Ladakh Scouts, while Thai units have included Infantry Regiments.
    • Objective: To build interoperability, mutual trust, and cooperation in counter-terrorism, insurgency management, and peacekeeping operations.

    Key Features:

    • Counter-Terrorism Focus: Joint training for counter-terror and counter-insurgency operations, especially in semi-urban and jungle terrain.
    • UN Mandate Training: Exercises designed to simulate peacekeeping operations under UN Charter VII.
    • Humanitarian Drills: Includes disaster relief, humanitarian assistance, and urban evacuation operations.
    • Strategic Relevance:
      • Strengthens India–Thailand defense cooperation under the 2012 MoU.
      • Supports India’s Act East Policy and shared maritime/strategic interests in the Bay of Bengal–Andaman Sea region.
      • Enhances interoperability for multinational operations and regional stability.
    [UPSC 2024] Which of the following statements about ‘Exercise Mitra Shakti-2023’ are correct?

    1. This was a joint military exercise between India and Bangladesh.

    2. It commenced in Aundh (Pune).

    3. Joint response during counter-terrorism operations was a goal of this operation.

    4. Indian Air Force was a part of this exercise.

    Select the answer using the code given below:

    Options: (a) 1, 2 and 3 (b) 1 and 4 (c) 1 and 4 (d) 2, 3 and 4*

     

  • Jan Vishwas Bill 2.0

    Why in the News?

    • The Jan Vishwas (Amendment of Provisions) Bill, 2025 was introduced in the Lok Sabha to further the government’s agenda of decriminalisation and rationalisation of laws.
    • This is the second Jan Vishwas Bill; the first (2023) decriminalised 183 provisions in 42 Acts.

    About the Jan Vishwas Bill 2.0:

    • Introduced in Lok Sabha (August 2025) as the second Jan Vishwas reform.
    • Seeks to amend 16 Central Acts across 10 ministries/departments.
    • Builds on the Jan Vishwas Act, 2023, which decriminalised 183 provisions in 42 Acts.
    • Aims to promote trust-based governance, ease of living, and ease of doing business.
    • Currently referred to a Lok Sabha Select Committee for examination.

    Key Features of the Bill:

    • Scope: Proposes amendments to 355 provisions:
      • 288 decriminalised (technical/procedural defaults).
      • 67 rationalised (ease of living).
    • Acts covered: RBI Act (1934), Drugs & Cosmetics Act (1940), Motor Vehicles Act (1988), Electricity Act (2003), Legal Metrology Act (2009), MSME Development Act (2006), Apprentice Act (1961), and others.
    • First-time Offences: Introduces “warning” and “improvement notice” in 76 offences (e.g., non-standard weights, MVA violations).
    • Decriminalisation: Removes imprisonment clauses for minor defaults, replacing them with fines or warnings.
      • Example: Electricity Act → imprisonment replaced with fines between ₹10,000 and ₹10 lakh.
    • Penalty Rationalisation: Automatic 10% increase in penalties every 3 years for repeat offences.
    • Objective: Ensure deterrence without overburdening courts and without repeated legislative amendments.

    Why was the Bill brought in?

    • Over-criminalisation in Indian laws:
      • 882 central laws; 370 contain criminal provisions for 7,305 offences (Vidhi Centre).
      • Many are trivial or outdated (e.g., penalties for routine acts like exercising pets incorrectly).
    • Business barriers:
      • ORF (2022) → Over 50% of 1,536 business laws carry jail terms; 37.8% of 69,233 compliances carry imprisonment clauses.
      • Creates fear among entrepreneurs, stifling growth.
    • Judicial pendency:
      • 3.6 crore criminal cases pending in district courts (Aug 2025).
      • 2.3 crore are over 1 year old.
      • Minor offences clog the system, delaying trials of serious crimes.
    • Governance reform agenda:
      • Aligns with PM Modi’s commitment to remove “unnecessary laws” (reiterated in Independence Day 2025 speech).
      • Supports ease of living and ease of doing business as core NDA governance planks.
    [UPSC 2012] What is/are the recent policy initiative(s)of Government of India to promote the growth of the manufacturing sector?

    1. Setting up of National Investment and Manufacturing Zones

    2. Providing the benefit of ‘single window clearance’

    3. Establishing the Technology Acquisition and Development Fund

    Select the correct answer using the codes given below:

    Options: (a) 1 only (b) 2 and 3 only (c) 1 and 3 only (d) 1, 2 and 3*

     

  • Induction of INS Udaygiri and INS Himgiri Stealth Nilgiri Class Frigates

    Why in the News?

    The Indian Navy has commissioned INS Udaygiri and INS Himgiri, Nilgiri-class frigates built under Project 17A, at Visakhapatnam.

    Induction of INS Udaygiri and INS Himgiri Stealth Nilgiri Class Frigates

    About INS Udaygiri & INS Himgiri:

    Feature INS Udaygiri INS Himgiri
    Builder Mazagon Dock Shipbuilders Ltd. (MDL), Mumbai Garden Reach Shipbuilders & Engineers (GRSE), Kolkata
    Series / Class 2nd ship of Project 17A;

    100th vessel designed by Navy’s Warship Design Bureau

    		 1st Project 17A frigate from GRSE
    Naming After Udaygiri mountain range (AP); earlier ship (1976–2007) Legacy of original INS Himgiri (1974–2005)
    Displacement / Size ~6,700 tonnes ~6,670 tonnes; Length: 149 m
    Propulsion CODOG (Combined Diesel or Gas) CODOG; speeds 28+ knots
    Stealth Features Reduced radar, infrared, and acoustic signatures Enhanced radar & IR signature reduction
    Armament BrahMos, Barak-8 SAMs, 76 mm gun, CIWS, advanced ASW weapons BrahMos, Barak-8, CIWS, ASW rocket launchers, torpedo tubes, EW systems
    Aviation Facilities – Flight deck + hangar for MH-60 Romeo, ALH Dhruv Mk-III, Sea King helicopters
    Indigenous Content ~75% (local sensors, systems, IPMS) ~75%

     

    [UPSC 2016] Which one of the following is the best description of ‘INS Astradharini’, that was in the news recently?

    Options: (a) Amphibious warfare ship (b) Nuclear-powered submarine (c) Torpedo launch and recovery vessel* (d) Nuclear-powered aircraft carrier

     

  • How have deception techniques evolved

    Introduction

    Modern warfare is no longer about firepower alone; it is equally about deception. As precision-guided missiles, drones, and AI-enabled targeting systems grow deadlier, militaries are turning to decoy technologies to confuse radars, mislead missiles, and protect valuable assets. India’s reported use of the AI-enabled X-Guard decoy during Operation Sindoor shows how deception has become a central element of national security strategy.

    The Growing Relevance of Deception in Modern Warfare:

    1. Evolving threat environment: Precision-guided munitions, drones, and AI-enabled targeting systems make military platforms highly vulnerable.
    2. Strategic asset: Decoys create confusion, waste enemy munitions, and buy crucial time for retaliation.
    3. Game-changing event: Operation Sindoor showcased India’s successful use of an AI-enabled decoy, termed by experts as “the best instance of spoofing and deception ever seen.”

    Inside the X-Guard Fibre-Optic Towed Decoy 

    1. Lightweight & reusable: At just 30 kg, retractable and deployable in flight.
    2. Radar mimicry: Replicates the Rafale’s Radar Cross Section (RCS), doppler velocity, and spectral signature across multiple bands.
    3. 360-degree jamming: Works seamlessly with the Rafale’s SPECTRA suite to form a layered defensive shield.
    4. Operational success: Reports suggest Pakistan’s J-10C fighters misidentified decoys as actual aircraft, wasting advanced PL-15E missiles.

    Global landscape of comparable decoy systems: 

    1. BriteCloud (Leonardo UL): Used on Eurofighter Typhoons, Gripen-Es, and some F-16s.
    2. AN/ALE-50/55 series (Raytheon/BAE Systems): Deployed on U.S. Navy F/A-18E/F Super Hornets.
    3. Adaptability to UAVs: Modified for platforms like Israeli Herons and U.S. MQ-9 Reapers.

    Battlefield deception on Land Forces: 

    1. Inflatable & heat-emitting decoys: Simulate tanks, artillery, and missile batteries to divert strikes.
    2. Ukraine’s wooden & 3D-printed fakes: Exhaust Russian drone and missile stocks.
    3. Russia’s Inflatech decoys: Create entire armoured formations in minutes.
    4. Indian Army initiative (2025): Issued a request for decoys mimicking T-90 tanks, including thermal and acoustic signatures.

    Naval countermeasures and Decoy strategies

    1. Layered naval countermeasures: Chaff, acoustic decoys, and offboard active deception protect against missiles and submarines.
    2. Nulka decoy (Australia–U.S.): Self-propelled system mimicking large ship radar signatures to mislead missile guidance.

    Conclusion

    Deception, once limited to camouflage and dummy equipment, has evolved into a sophisticated digital-age shield. Airborne fibre-optic decoys, inflatable ground tanks, and naval missile deflectors now define modern survivability. India’s reported use of the X-Guard highlights its adaptation to the evolving battlefield. For a relatively low investment, such systems deliver high-impact protection, proving that in the wars of tomorrow, deception may be as decisive as destruction.

    PYQ Relevance

    “How is S-400 air defence system technically superior to any other system presently available in the world?”

    Linkage: This question shows UPSC’s focus on defence technology and comparative capability analysis. The same lens applies to India’s deployment of AI-enabled decoys like the X-Guard FOTD, which enhance survivability against advanced missile systems. Both highlight the importance of evaluating cutting-edge military technology for national security.

  • Asgard Archaea and the Evolution of Complex Cells

    Why in the News?

    Recent research by IISc on Asgard archaea — the closest living relatives of eukaryotes — has shed new light on how simple prokaryotic cells evolved into complex eukaryotic cells with nuclei, cytoskeletons, and organelles.

    About Asgard Archaea:

    • Nature: Tiny microbes living in deep-sea mud and extreme environments.
    • Evolutionary Link: Closest relatives of eukaryotic cells (plants, animals, humans).
    • Importance: Help explain how simple prokaryotic cells (bacteria/archaea) evolved into complex eukaryotic cells.
    • Significance: Considered the “missing link” in the origin of complex life.

    Findings from Indian Institute of Science (IISc) Study:

    • Focus: Scientists studied a subgroup called Odinarchaeota.
    • Discovery: Found two FtsZ genes (most microbes have one) and a tubulin-like gene.
      • FtsZ1: Works like bacterial proteins → forms straight filaments and attaches to cell membranes.
      • FtsZ2: Builds spiral structures but needs helper proteins to stick to membranes.
    • Division of Labour: Cooperation of FtsZ1 and FtsZ2 shows early signs of cellular specialisation.
    • Clue for Evolution: Suggests Asgard microbes were already experimenting with primitive “cytoskeleton” systems, paving way for complex cells.
    [UPSC 2012] Which one of the following sets of elements was primarily responsible for the origin of life on the Earth?

    Options:

    (a) Hydrogen, Oxygen, Sodium

    (b) Carbon, Hydrogen, Nitrogen*

    (c) Oxygen, Calcium, Phosphorus

    (d) Carbon, Hydrogen, Potassium

     

  • Integrated Air Defence Weapon System (IADWS) 

    Why in the News?

    The DRDO has successfully conducted the maiden flight-tests of the Integrated Air Defence Weapon System (IADWS) off the coast of Odisha.

    Integrated Air Defence Weapon System (IADWS) 

    About the Indigenous Air Defence Weapon System (IADWS):

    • Overview: A multi-layered indigenous system developed to neutralise a wide spectrum of aerial threats.
    • Integration: Combines 3 components viz. Quick Reaction Surface-to-Air Missiles (QRSAM), Very Short Range Air Defence System (VSHORADS), and Directed Energy Weapon (DEW).
    • Control: All systems are networked through a Command-and-Control Centre developed by the Defence Research and Development Laboratory (DRDL), Hyderabad.

    Key Components of IADWS:

    1. QRSAM:
      • Short-range missile system for protecting moving Army armoured formations.
      • Range: 3–30 km.
      • Equipped with 360° surveillance and tracking radars.
      • Fully automated, mobile, and capable of “search on move” and “track on move.”
    2. VSHORADS:
      • Fourth-generation man-portable air defence system (MANPAD).
      • Range: 300 m – 6 km.
      • Targets include drones, UAVs, and low-altitude aerial threats.
      • Deployable across Army, Navy, and Air Force.
    3. Directed Energy Weapon (DEW):
      • Vehicle-mounted laser system.
      • Range: <3 km.
      • Proven in field trials against UAVs and drone swarms.

    Strategic Significance:

    • Multi-Layer Defence: Provides aerial protection up to 30 km against threats from drones to fighter jets.
    • Self-Reliance: Enhances indigenous capability, reducing dependence on imported defence systems.
    • National Security: Strengthens preparedness for Mission Sudarshan Chakra — India’s planned national air defence shield.
    • Technological Integration: Demonstrates India’s leap in combining missile and laser-based defence on a single platform.
    • Geostrategic Importance: Seen as a milestone in India’s path to advanced, self-reliant defence systems.
    [UPSC 2018] What is “Terminal High Altitude Area Defense (THAAD)”, sometimes seen in the news?

    Options:

    (a) An Israeli radar system

    (b) India’s indigenous anti-missile programme

    (c) An American anti-missile system*

    (d) A defence collaboration between Japan and South Korea

     

  • Nepal officially joins IBCA

    Why in the News?

    Nepal has officially joined the International Big Cat Alliance (IBCA), an India-led global initiative to protect seven species of big cats.

    About the International Big Cat Alliance (IBCA)

    • Overview: A global multi-country, multi-agency alliance of 95 countries (range and non-range) focused on conserving big cats and their habitats.
    • Launch: Proposed by PM Modi in 2019; officially launched in April 2023 on Project Tiger’s 50th anniversary.
    • Conservation Scope: Works to protect 7 species of big cats — tiger, lion, leopard, snow leopard, cheetah, jaguar, and puma.
    • Functions: Operates through advocacy, knowledge-sharing, eco-tourism promotion, and resource mobilisation.
    • Conflict Mitigation: Aims to reduce human–wildlife conflict and restore degraded habitats.
    • Institutional Structure:
      • Governance: Managed by a General Assembly, elected Council, and Secretariat headed by a Secretary-General.
      • Headquarters: Permanent base established in India following ratification of the HQ agreement.

    Global Participation

    • Membership: Includes 95 countries across Asia, Africa, the Americas, and Europe/Central Asia. Examples:
      • Asia: India, China, Nepal, Pakistan, Iran.
      • Africa: Kenya, Congo, Ghana.
      • Americas: Brazil, Ecuador, United States.
      • Europe/Central Asia: Russia, Kazakhstan.
    • Ratification: Bhutan, Eswatini, Cambodia, Guinea, India, Liberia, Nicaragua, Somalia, and Suriname have deposited ratification instruments.

    India’s Role:

    • Biodiversity Hub: India hosts 5 of the 7 big cats — tiger, lion, leopard, snow leopard, and cheetah — and holds 70% of global tiger population.
    • Funding: Government committed ₹150 crore for 2023–2028; mobilising international contributions.
    • Leadership: India sets global benchmarks in wildlife conservation and ecological stewardship, positioning itself as a leader in big cat protection.
    [UPSC 2024] Consider the following statements:

    1. Lions do not have a particular breeding season.

    2. Unlike most other big cats, cheetahs do not roar.

    3. Unlike male lions, male leopards do not proclaim their territory by scent marking.

    Which of the statements given above are correct?

    (a) 1 and 2 only * (b) 2 and 3 only (c) 1 and 3 only (d) 1, 2 and 2