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  • [10th September 2025] The Hindu Op-ed: The long march ahead to technological independence

    PYQ Relevance

    [UPSC 2023] What is the status of digitalization in the Indian economy? Examine the problems faced in this regard and suggest improvement.

    Linkage: The article highlights that while India has rapidly digitalised its economy, dependence on foreign software, cloud, and hardware exposes vulnerabilities. This reflects the structural problems of inadequate indigenous technology and lack of sovereignty. Achieving technological independence through open-source and hardware self-reliance is a crucial improvement pathway.

    Mentor’s Comment

    On India’s 79th Independence Day, Professor P.J. Narayanan reminds us that freedom today is no longer defined by political borders alone, but by technological sovereignty. As cyber wars, AI dependency, and cloud vulnerabilities reshape geopolitics, India must undertake its own “long march” towards self-reliance in both software and hardware. This article critically explores the risks of dependence, the promise of open source, and the urgent need for collective will to achieve true independence.

    Introduction

    India’s hard-won political freedom was achieved through decades of struggle, but in the 21st century, sovereignty extends beyond flags and constitutions. Technology is now the true battlefield, with wars fought in cyberspace, economies run by software, and critical infrastructure dependent on a handful of global corporations. This dependence poses a strategic vulnerability. The call for technological independence, therefore, is not just a matter of pride but of survival and security.

    The renewed urgency of technological sovereignty

    India’s 79th Independence Day has highlighted a pressing reality: while politically independent, the nation remains technologically dependent on foreign companies that control critical digital infrastructure. With modern conflicts increasingly fought through cyberspace, and with real incidents of cloud service disruptions causing harm, the vulnerability is no longer hypothetical. For the first time, technology dependence is being discussed in terms of national sovereignty, marking a paradigm shift from past concerns that were limited to strategic sectors.

    The Geopolitical Risks of Technology Dependence

    1. Cyber wars: Modern conflicts are less about bombs and more about software, drones, and cyberattacks.
    2. Critical infrastructure: Banks, trains, and power grids are run on ICT largely controlled by a few foreign firms.
    3. National diktat risks: If cloud/AI services are switched off under pressure from foreign governments, India’s economy and security could face paralysis.
    4. Real precedent: A recent stoppage of cloud services to a company proved this is not a theoretical danger.

    Defining technological sovereignty in the Indian context

    1. Lack of foundational software: India has no indigenous operating system, database, or foundational software it can fully trust.
    2. Open-source pathway: Linux, Android, and Hadoop show that community-driven, transparent solutions are possible.
    3. Challenge of sustainability: Success requires long-term support, continuous updates, and a large user base.
    4. Role of IT professionals: India’s tech community must unite to develop, maintain, and secure indigenous systems.

    Hardware sovereignty as the bigger challenge

    1. Semiconductor fabs: Require massive, long-term investments and expertise in design, manufacturing, and supply chains.
    2. Strategic prioritisation: India should start with specific hardware components, chip design, and assembly even if fabrication remains outsourced.
    3. Global lessons: Countries like Taiwan and South Korea built expertise over decades through patient national strategies.

    Open-source solutions for technological independence

    1. Gift of society: Open-source is not about opposition, but about self-support and resilience.
    2. Current limitations: Even though Android, Linux, and Hadoop are open-source, control lies with centralised cloud companies.
    3. Social movement: Just as India’s freedom was driven by collective will, a people-led movement for open-source adoption is needed.
    4. Business viability: The model must go beyond government/private funds and become self-sustaining, with people explicitly paying for trusted software.

    Immediate steps towards technological sovereignty

    1. Assemble crack teams: Develop client-side tools (database, email, calendar) and server-side tools (cloud, web, email).
    2. Product model: Teams must function like professional product-development units, not academic research groups.
    3. Mission approach: A dedicated national mission should be set up for implementation, backed by strong engineers and project managers.
    4. Enabling role of government: Focus on building a self-sustaining ecosystem with business incentives and regulatory support.

    Conclusion

    The 20th century saw India march towards political freedom; the 21st century demands a march towards technological freedom. Dependence on foreign systems is a strategic vulnerability that could cripple the nation in times of crisis. With its talent pool, thriving IT ecosystem, and democratic will, India has both the capacity and urgency to achieve technological sovereignty. The call of the hour is collective resolve, sustained investment, and a mission-driven approach.

  • [pib] Regulation of Biostimulants in India

    Why in the News?

    India now has a comprehensive regulatory framework for biostimulants, placing it among the few countries with such dedicated oversight.

    What are Biostimulants?

    • Definition: Under Fertilizer Control Order (FCO), 1985, Clause 20C, biostimulants are substances or micro-organisms that stimulate plant processes to improve nutrient uptake, growth, yield, crop quality, efficiency, and stress tolerance.
    • Exclusion: They are not pesticides or plant growth regulators, which fall under the Insecticides Act, 1968.
    • Categories (Schedule VI, FCO): Botanical extracts (including seaweed), protein hydrolysates and amino acids, vitamins, biochemicals, antioxidants, anti-transpirants, humic and fulvic acids, cell-free microbial products, and live micro-organisms (excluding biofertilizers/biopesticides).

    Regulation Timeline:

    • Before 2021: Nearly 30,000 unregulated products in Indian markets.
    • Feb 2021: Included under FCO; provisional registration system (G3 certificates) introduced; about 8,000 products approved temporarily.
    • Current Status: Only 146 products formally notified in Schedule VI.

    Key Amendments (2021–2025):

    • 2021: Biostimulants legally recognised under FCO.
    • 2023–24: Provisional validity extended to avoid disruption.
    • 2025:
      • Live micro-organisms (excluding biofertilizers/biopesticides) added as a category.
      • Pesticide residue limit raised from 0.01 ppm to 1 ppm.
      • Stricter quality testing, labelling, and safety standards enforced.
      • Provisional system discontinued.

    Significance:

    • Protects farmers from spurious/unproven products.
    • Encourages validated indigenous products under Atmanirbhar Bharat.
    • Establishes quality, safety, and labelling standards through Gazette notifications.
    • Makes India one of the few countries with a dedicated Biostimulant law, balancing farmer welfare, environmental safety, innovation, and regulation.
    [UPSC 2013] Consider the following organisms:

    1.Agaricus 2.Nostoc 3.Spirogyra

    Which of the above is/are used as biofertilizer/biofertilizers?

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

     

  • [pib] Exercise ZAPAD 2025

    Why in the News?

    An Indian Armed Forces contingent has departed for Mulino Training Ground, Nizhniy, Russia, to participate in Exercise ZAPAD 2025.

    About Exercise ZAPAD:

    • Meaning: “ZAPAD” means West in Russian; a series of large-scale joint strategic military drills led by Russia and Belarus.
    • Origins: Started during the Soviet era with Zapad-77, Zapad-81, Zapad-84, reflecting Cold War dynamics.
    • Post-Soviet Revival: Resumed with Zapad-99 (1999), partly as a response to NATO’s Yugoslavia operations.
    • Frequency: Held about once every 4 years, with major editions in 2009, 2013, 2017, 2021, and 2025.
    • Series Context: Forms part of Russia’s rotating operational drills along with Vostok (East), Tsentr (Central), and Kavkaz (Caucasus).
    • Scale: Zapad-2021 involved ~200,000 personnel from 17 countries, one of the largest recent drills.

    Geopolitical Significance:

    • Deterrence: Sends a strategic message to NATO about Russian readiness.
    • Allied Assurance: Reassures Russia’s partners and allies of its military strength.
    [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*

     

  • Neurogenesis in the Human Brain

    Why in the News?

    A recent study (2025, Science) found young neurons in the adult brain, challenging the old belief that Neurogenesis (neurons formation) occur only in childhood.

    What is Neurogenesis?

    • Overview: Formation of new neurons from stem or progenitor cells.
    • Established in Animals: Well-known in mice, rats, and monkeys; also active during human childhood development.
    • Debate in Humans: Longstanding question if it continues in adulthood, especially in the hippocampus (brain’s memory and learning hub).
    • Hippocampal Role: The dentate gyrus is believed to sustain lifelong neurogenesis, helping in memory formation, flexibility, and stress control.

    Key findings of the Study:

    • Conducted by: Karolinska Institutet, Stockholm, published in Science (2025).
    • Study: Analysed 400,000 neurons from post-mortem hippocampus samples of people aged from infants (<1 year) to 78 years.
    • Methodology: Used single nuclei RNA sequencing with machine learning to detect signs of new cells.
    • Outcome: Validated with RNAscope and Xenium imaging, which confirmed the presence of neural stem cells, progenitors, and young neurons (neuroblasts) even in adolescent and adult brains.

    Why are the findings important?

    • Evidence in Adults: Strong proof that new neurons form in adult brains, not just in early years.
    • Evolutionary Insight: Suggests neurogenesis is a conserved feature across mammals, not unique to certain species.
    • Brain Functions: Explains memory flexibility, ability to overwrite memories, and resilience to stress.
    • Therapeutic Potential: Opens up scope for regenerative treatments in brain disorders like Alzheimer’s, Parkinson’s, and dementia by stimulating local progenitor cells.
    • Lifestyle Link: Implies that exercise, social connections, and stress levels could influence how much neurogenesis happens in individuals.
    [UPSC 2024] Which one of the following is synthesised in human body that dilates blood vessels and increases blood flow?

    Options: (a) Nitric oxide* (b) Nitrous oxide (c) Nitrogen dioxide (d) Nitrogen pentoxide

     

  • WHO’s Model List of Essential Medicines (EML)

    Why in the News?

    Semaglutide, a drug originally developed for type 2 diabetes but also highly effective for weight reduction has been added to the WHO’s Model List of Essential Medicines (EML).

    What is Semaglutide?

    • Overview: A GLP-1 receptor agonist drug developed for Type 2 Diabetes, also effective in weight reduction.
    • Mode of Action: Stimulates insulin secretion, lowers blood glucose, slows gastric emptying, and suppresses appetite.
    • Brand Names: Ozempic (diabetes), Wegovy (obesity/weight loss).
    • WHO Recognition (2025): Added to the 24th EML, highlighting its dual role in diabetes and obesity management.
    • Significance: Its inclusion pressures health systems to expand access and make it more affordable worldwide.
    • Relevance for India: With 100+ million diabetics (2nd highest globally) and a rising obesity burden, Semaglutide could be a public health game-changer if affordability improves.

    About WHO’s Model List of Essential Medicines (EML):

    • What is it: A global reference by WHO listing the most effective, safe, and essential medicines for priority healthcare needs.
    • History: First introduced in 1977 to improve access in developing countries; updated every 2 years by a WHO Expert Committee.
    • Structure:
      • Core list: Basic medicines usable with limited infrastructure.
      • Complementary list:  Need specialised training, facilities, or are costlier.
    • Global Impact: Over 150 countries use EML to build national lists for procurement, reimbursement, and universal health coverage (UHC).
    • Selection Criteria:
      • Public health relevance.
      • Proven efficacy and safety.
      • Cost-effectiveness compared to alternatives.
      • Quality, stability, and reliable formulations.
      • Preference for single-compound formulations unless combinations are better.
    [UPSC 2024] In which of the following are hydrogels used?

    1. Controlled drug delivery in patients 2. Mobile air-conditioning systems 3. Preparation of industrial lubricants

    Select the correct answer using the code given below:

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

     

  • [8th September 2025] The Hindu Op-ed: A complex turn in India’s FDI story

    PYQ Relevance

    [UPSC 2016] Justify the need for FDI for the development of the Indian economy. Why there is gap between MOUs signed and actual FDIS? Suggest remedial steps to be taken for increasing actual FDIs in India.

    Linkage: The article highlights that although India records high gross inflows ($81 bn in FY 2024–25), massive repatriations and outward FDI reduce net retained capital, weakening industrial growth, directly reflecting the gap between headline FDI figures and actual developmental impact, just like the MOU–FDI gap in the question. Structural barriers such as regulatory opacity, policy unpredictability, and weak infrastructure explain why capital commitments don’t translate into long-term projects. The remedial steps suggested, simplified regulations, policy consistency, and infrastructure upgrades, align with the measures demanded in the UPSC 2016 question.

    Mentor’s Comment

    Foreign Direct Investment (FDI) has long been celebrated as one of the most powerful engines of India’s growth since the reforms of 1991. It brought in capital, technology, and global linkages. Yet, beneath the shining surface of record inflows lies a disquieting reality, unprecedented outflows, disinvestments, and a shift away from long-term industrial commitments. This article explores the nuanced challenges in India’s FDI ecosystem, the divergence between inflows and outflows, and the urgent need for reforms.

    Introduction

    FDI has been central to India’s growth story, particularly after liberalisation in 1991, modernising industries and integrating India into global markets. While e-commerce and IT saw transformative capital inflows, recent years mark a complex shift. Despite India recording $81 billion in gross FDI inflows in FY 2024–25, net retained capital fell drastically due to massive repatriations and rising outward investments by Indian firms. This has profound implications for industrial growth, job creation, and long-term economic resilience.

    Divergence Between Inflows and Outflows

    1. Gross inflows: $81 billion in FY 2024–25, up 13.7% from last year.
    2. Sharp withdrawals: Disinvestments surged by 51% in FY 2023–24 to $44.4 billion and further to $51.4 billion in FY 2024–25.
    3. Net retained capital: Fell to just $0.4 billion after accounting for outflows, a stark erosion of confidence.
    4. Investor behaviour shift: From long-term commitments to short-term tax arbitrage and profit-seeking.

    The Decline of Manufacturing in FDI Trends

    1. Declining share: Manufacturing’s share in FDI dropped to a mere 12% of total inflows.
    2. Short-term focus: Preference for rent-seeking sectors such as financial services, hospitality, and energy distribution.
    3. Weak multiplier effects: Unlike manufacturing or infrastructure, these sectors do not create broad-based industrial or technological growth.

    The Surge of Indian Capital Abroad

    1. Outward FDI: Rose from $13 billion in FY 2011–12 to $29.2 billion in FY 2024–25.
    2. Reasons cited: Regulatory inefficiencies, infrastructure gaps, and unpredictable policies.
    3. Destinations: Nearly half of outflows directed toward developed economies with stable tax regimes and strategic resources.

    Structural Barriers in India’s Investment Climate

    1. Regulatory opacity: Complex compliance requirements discourage investors.
    2. Legal unpredictability: Frequent policy shifts undermine confidence.
    3. Governance inconsistencies: Contrast between reforms on paper and actual execution.
    4. Dominance of tax havens: Mauritius and Singapore continue to account for bulk inflows, driven by treaty-based tax strategies.

    Why the Long Term Matters

    1. FDI as stability cushion: Supports balance of payments, currency stability, and external accounts.
    2. Declining net inflows: Curtails India’s monetary policy flexibility.
    3. RBI’s concern: Outflows align with global emerging market trends but pose systemic risks if unchecked.
    4. Need for committed capital: Advanced manufacturing, clean energy, and technology sectors require sustained inflows.

    What Needs to Be Done

    1. Simplify regulations: Reduce compliance burden and procedural delays.
    2. Ensure policy consistency: Long-term clarity to build investor trust.
    3. Upgrade infrastructure: Logistics, energy, and digital backbones to attract manufacturing FDI.
    4. Strengthen institutions: Predictable legal frameworks and efficient governance.
    5. Invest in human capital: Education and skilling to meet industry demands.

    Conclusion

    India’s FDI story is at a crossroads. Gross inflows remain high, but capital is no longer staying long enough to catalyse industrial growth. The rising tide of disinvestment by foreign firms and outward FDI by Indian companies reflects systemic inefficiencies, weak confidence, and policy unpredictability. If India aspires to be a global investment hub, reforms must focus on quality, durability, and alignment of capital with national developmental goals.

    Value Addition

    Official Definition of FDI

    • IMF/UNCTAD definition: A cross-border investment where a resident entity in one economy obtains a lasting interest and a significant degree of influence in the management of an enterprise in another economy.
    • India (RBI): “Investment by a person resident outside India in the capital of an Indian company under Schedule 1 of FEMA Regulations, 2000.”

    Foreign Direct Investment (FDI) Routes in India

    • Automatic Route: No prior approval required; investor only informs RBI after investment.
      • Examples: 100% FDI in e-commerce marketplace model, renewable energy, and computer software.
    • Government Route: Prior approval of the Government of India required.
      • Examples: FDI in multi-brand retail, defence beyond 74%, and print media.

    Regulation of FDI in India

    • Ministry of Commerce and Industry: Frames FDI policy, announced via Consolidated FDI Policy Circular.
    • Department for Promotion of Industry and Internal Trade (DPIIT): Nodal body for policy formulation and coordination.
    • RBI: Governs reporting, inflows, and compliance under FEMA, 1999.
    • Sectoral Regulators: Defence, Insurance, Banking, Telecom, etc. may impose additional conditions.

    Barriers to FDI in India

    • Regulatory opacity: Complex rules and compliance increase transaction costs.
    • Policy unpredictability: Frequent changes in taxation (e.g., retrospective tax) weaken investor trust.
    • Infrastructure gaps: Logistics bottlenecks, power shortages, and urban congestion raise costs.
    • Legal uncertainties: Contract enforcement and dispute resolution remain weak.
    • Governance challenges: Land acquisition, bureaucratic delays, and inconsistent state-level policies.

    Global Comparative Analysis

    • China: Strong manufacturing-centric FDI policies, large SEZs, predictable incentives, and world-class infrastructure helped it emerge as the world’s largest FDI recipient.
    • Vietnam: Stable policy frameworks, competitive labour costs, and integration into global supply chains (electronics, textiles) made it a hub for relocated investments.
    • Singapore & Mauritius: Dominant sources of FDI into India, largely due to tax treaty advantages rather than productive investment.
    • India: Despite being among the top FDI destinations (UNCTAD report), outflows and repatriations remain high, reflecting weak long-term retention.

  • The making of an ecological disaster in the Nicobar

    Introduction

    The Great Nicobar Island Project, with an estimated expenditure of ₹72,000 crore, has sparked unprecedented controversy. Instead of strengthening India’s ecological security and inclusive growth, the project threatens to uproot indigenous communities such as the Nicobarese and the Shompen, destroy one of the world’s richest biodiversity hotspots, and expose the island to severe natural disaster risks. By bypassing constitutional bodies, statutory protections, and scientific warnings, the project raises fundamental questions about governance, justice, and sustainability in India’s developmental trajectory.

    Uprooting Tribal Communities

    1. Nicobarese displacement: The project site overlaps with ancestral villages of the Nicobarese, already displaced once by the 2004 tsunami. Their hope of return will now be permanently extinguished.
    2. Shompen threat: The Shompen, classified as a Particularly Vulnerable Tribal Group (PVTG), face cultural and ecological extinction as their reserve land is denotified and forests destroyed.
    3. Violation of tribal safeguards: Article 338A mandates consultation with the National Commission for Scheduled Tribes, which was bypassed. The Tribal Council’s objections were ignored after being “rushed” into signing a no-objection letter, later revoked.

    Mockery of Legal and Regulatory Safeguards

    1. Social Impact Assessment failure: The 2013 Act on Land Acquisition and Rehabilitation excluded Nicobarese and Shompen from consideration, denying them stakeholder status.
    2. Forest Rights Act ignored: The Shompen’s authority to regulate and protect forests was bypassed.
    3. Constitutional neglect: Bodies like NCST and local tribal councils were side-lined, undermining democratic accountability.

    The Farce of Compensatory Afforestation

    1. Massive tree felling: The Ministry projects 8.5 lakh trees may be cut, but independent estimates put the figure between 32–58 lakh.
    2. Afforestation mismatch: Compensatory afforestation is planned in Haryana, thousands of kilometres away, with a completely different ecology.
    3. Mining contradiction: A quarter of this afforestation land has been auctioned for mining, nullifying the mitigation strategy.
    4. CRZ violation: Port site falls under CRZ 1A, which prohibits construction due to turtle nesting sites and coral reefs.

    Ecological and Wildlife Concerns

    1. Nicobar long-tailed macaque: Primatologists’ warnings on its survival risks were ignored.
    2. Sea turtle nesting mis-assessed: Surveys were conducted off-season, compromising accuracy.
    3. Dugong impact underestimated: Drone-based surveys only covered shallow waters.
    4. Biased assessments: Reports were allegedly conducted under duress, undermining credibility.

    A Disaster-Prone Location

    1. Tsunami precedent: In 2004, the island subsided by 15 feet.
    2. Seismic zone risk: A 6.2 magnitude earthquake in July 2025 reinforced its vulnerability.
    3. Jeopardising investment: Infrastructure and lives face catastrophic risk from earthquakes and tsunamis.

    Conclusion

    The Great Nicobar Project symbolizes an ecological and humanitarian misadventure where short-term ambitions eclipse constitutional morality, environmental prudence, and tribal justice. The survival of the Nicobarese and Shompen, along with an irreplaceable ecosystem, hangs in the balance. True development must integrate ecological sustainability and social justice rather than sacrifice them at the altar of misplaced mega-infrastructure.

    Value Addition

    Way Forward

    • Inclusive Development with Tribal Consent
      • Ensure free, prior, and informed consent of Nicobarese and Shompen communities in line with the Niyamgiri judgment (2013).
      • Empower tribal councils in decision-making as mandated by the Forest Rights Act (2006).
    • Strengthening Legal and Institutional Safeguards
      • Consult the National Commission for Scheduled Tribes (NCST) and respect constitutional provisions under Article 338A.
      • Strengthen Social Impact Assessments with participation of affected communities.
    • Rethinking Compensatory Afforestation
      • Undertake afforestation within island ecosystems, not in distant states like Haryana.
      • Promote ecosystem restoration rather than mere plantation drives.
    • Ecologically Sensitive Area Protection
      • Enforce CRZ 1A norms protecting turtle nesting sites, coral reefs, and coastal biodiversity.
      • Recognise Great Nicobar as an Ecologically Sensitive Zone (ESZ) under Environment Protection Act.
    • Disaster-Resilient Planning
      • Recognise that Great Nicobar lies in Seismic Zone V and redesign infrastructure accordingly.
      • Adopt a low-impact development model suited for fragile ecosystems (eco-tourism, research hubs, small-scale renewable energy).
    • Alternative Growth Models
      • Focus on sustainable livelihoods for locals (fisheries, forest produce, heritage tourism).
      • Leverage the island’s location for strategic security through minimal-impact naval installations, avoiding large-scale civilian displacement.

    PYQ Relevance

    [UPSC 2017] ‘Climate Change’ is a global problem. How India will be affected by climate change? How Himalayan and coastal states of India will be affected by climate change?

    Linkage: The Great Nicobar Project directly links to this PYQ as it illustrates how climate change impacts combine with ill-planned development to heighten risks. Rising sea levels and intensifying cyclones threaten India’s coastal states, while Great Nicobar, lying in a seismically active and tsunami-prone zone, showcases the compounded vulnerability of fragile ecosystems and communities. Thus, it exemplifies how coastal regions face existential risks when climate change interacts with unsustainable projects.

  • ‘Blood Moon’ and Lunar Eclipse

    Why in the News?

    Viewers across Asia, Australia, and parts of Africa witnessed a Blood Moon on 8th September, a spectacular form of total lunar eclipse visible.

    About Lunar Eclipse:

    • Overview: Happens when Earth comes between Sun and Moon, blocking sunlight from reaching the Moon.
    • Earth’s Shadow:
      • Umbra: Dark central shadow, causes total or partial eclipses.
      • Penumbra: Outer shadow, causes faint dimming.
    • Types:
      1. Total Eclipse: Moon passes fully through umbra.
      2. Partial Eclipse: Only part of Moon enters umbra.
      3. Penumbral Eclipse: Moon passes through penumbra with subtle darkening.
    • Frequency: Occurs 2–4 times per year, visible from different regions.

    Why lunar eclipse don’t occur every month?

    : Lunar eclipses don’t happen every month because the Moon’s orbit around the Earth is tilted by about 5 degrees relative to the Earth’s orbit around the Sun. This tilt, known as orbital inclination, means that during a full Moon, the Moon often passes above or below Earth’s shadow, preventing a perfect alignment required for an eclipse. Eclipses only occur when the alignment is precise, allowing the Sun, Earth, and Moon to line up in a straight line.

    What is Blood Moon?

    • Meaning: Refers to the reddish glow of the Moon during a total lunar eclipse.
    • Cause: Rayleigh scattering in Earth’s atmosphere.
      • Short wavelengths (blue, violet) scatter away.
      • Longer wavelengths (red, orange) bend around Earth and light the Moon.
    • Colour Intensity:
      • Presence of dust, aerosols, volcanic ash deepens the red shade.
      • Cleaner atmosphere produces a lighter red or orange.
    • Historical Insight: Medieval records of Blood Moons helped identify volcanic eruptions between 1100–1300 CE, confirmed by a 2023 University of Geneva study.

    Significance:

    • Scientific: Acts as a natural indicator of atmospheric composition, dust, and pollution; helps model planetary atmospheres.
    • Historical/Environmental: Provides evidence of past volcanic events and climate conditions.
    • Cultural: Linked to myths and superstitions, though harmless scientifically.
    • Public Engagement: Widely followed celestial event that aids astronomy outreach and awareness.
    [UPSC 2019] On 21st June, the Sun

    Options: (a) does not set below the horizon at the Arctic Circle*

    (b) does not set below the horizon at Antarctic Circle

    (c) shines vertically overhead at noon on the Equator

    (d) shines vertically overhead at the Tropic of Capricorn

     

  • New Horizons and Stellar Parallax Navigation

    Why in the News?

    A recent study has showcased that spacecrafts can locate themselves using a simple stellar parallax method with just two nearby stars, without relying on Earth.

    New Horizons and Stellar Parallax Navigation

    What is Stellar Parallax?

    • Overview: Stellar parallax is the apparent shift in a star’s position against background stars when observed from two different vantage points.
    • Example: On Earth, this is measured every 6 months as the planet moves to opposite sides of its orbit.
    • Parallax Angle: The degree of this shift gives the star’s distance. Larger parallax means the star is closer.
    • Application in Space: By observing stars from both Earth and a spacecraft (billions of km apart), the relative positions can be compared to calculate the spacecraft’s distance.

    About the New Horizons Demonstration:

    • Spacecraft: Launched in 2006, New Horizons explored Pluto (2015) and is now beyond 60 AU (astronomical units).
    • Observation: On April 23, 2020, astronomers measured parallaxes of Proxima Centauri (4.2 light years) and Wolf 359 (7.9 light years) using Earth-based telescopes and New Horizons’ onboard instruments.
    • Results:
      • Proxima’s parallax: 32.4 arcseconds
      • Wolf 359’s parallax: 15.7 arcseconds
      • Derived spacecraft position: 46.89 AU, matching DSN’s 47.11 AU reading.
    • Requirements: Only a camera, onboard computer, and stellar catalogue — no special equipment needed.

    Significance:

    • Self-sufficient Navigation: Enables spacecraft to calculate their position without depending solely on Earth-based radio signals.
    • For Future Missions: Particularly useful for interstellar missions, where Earth’s beacons won’t be practical.
    • Simplicity: Unlike more complex astrometric navigation or pulsar navigation, this method is accessible with minimal hardware.
    • Educational Value: Though not precise enough yet for real-time navigation, it is a proof of concept for deep-space autonomy.
    [UPSC 2012] A person stood alone in a desert on a dark night and wanted to reach his village which was situated 5 km east of the point where he was standing. He had no instruments to find the direction, but he located the polestar. The most convenient way now to reach his village is to walk in the:

    Options: (a) direction facing the polestar

    (b) direction opposite to the polestar

    (c) direction keeping the polestar to his left *

    (d) direction keeping the polestar to his right

     

  • RNA–Amino Acid Link clues to Origin of Life

    Why in the News?

    A recent study published in the Nature suggests that simple molecules called aminoacyl-thiols may have helped amino acids stick to RNA (ribonucleic acid) without enzymes, giving clues to how protein-making began on early Earth.

    About the RNA–Amino Acid Link:

    • Discovery: Study showed that aminoacyl-thiols (simple prebiotic molecules) can attach amino acids to RNA directly (aminoacylation) without enzymes.
    • Modern Parallel: In cells today, this is done by aminoacyl-tRNA synthetases before ribosomes build proteins. This created the “chicken-and-egg problem”: proteins are needed to make proteins.
    • Chemical Mechanism:
      • Thioesters: Enable amino acids to attach to RNA (“charging RNA”).
      • Thioacids: Enable amino acids to link into peptides.
    • Robustness: Works at neutral pH, across many amino acids, with unexpected selectivity for RNA despite other molecules being more reactive.

    Significance for Origin of Life:

    • RNA World Hypothesis: Supports the idea that RNA and amino acids interacted directly before enzymes evolved.
    • Chemical Advantage: Shows RNA had a natural edge in early Earth conditions, explaining its central role in life’s origin.
    • Prebiotic Plausibility: Aminoacyl-thiols could form from simple nitriles and thiols, and reactions occurred even in cold/frozen pools resembling early Earth.
    • Evolutionary Pathway: Suggests life began with short peptides, with RNA later evolving control, leading to coded protein synthesis and ribosomes.
    [UPSC 2022] Consider the following statements : DNA Barcoding can be a tool to:

    1. assess the age of a plant or animal.

    2. distinguish among species that look alike.

    3. identify undesirable animal or plant materials in processed foods.

    Which of the statements given above is/are correct ?

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