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Subject: Science and Technology

  • PMOS (Earlier PCOS)

    Why in the News?

    A global medical consensus led by Monash University renamed Polycystic Ovary Syndrome (PCOS) as Polyendocrine Metabolic Ovarian Syndrome (PMOS) to better reflect its multisystem nature.

    What is PMOS?

    • PMOS is a hormonal, metabolic, and reproductive disorder affecting women of reproductive age.
    • It involves:
      • Excess androgen production
      • Irregular ovulation
      • Metabolic dysfunction
      • Psychological and skin-related symptoms

    Full Form of PMOS

    • Polyendocrine: Multiple hormonal systems affected
    • Metabolic: Linked with diabetes, obesity, insulin resistance
    • Ovarian: Reproductive involvement
    • Syndrome: Group of symptoms

    Why Was PCOS Renamed?

    • The term “PCOS” focused mainly on ovaries and “cysts”.
    • Experts noted that the condition also involves:
      • Hormonal imbalance
      • Metabolic disorders
      • Endocrine complications

    Major Features of PMOS

    • Metabolic Features
      • Obesity
      • Type 2 diabetes
      • Dyslipidemia
      • Hypertension
      • Fatty liver disease (MASLD)
    • Reproductive Features
      • Irregular periods
      • Infertility
      • Ovulation problems
      • Pregnancy complications
    • Psychological Features
      • Depression
      • Anxiety
      • Eating disorders
    • Dermatological Features
      • Acne
      • Facial hair growth
      • Hair thinning

    Importance for India

    • Estimated prevalence in India: 16% to 18%
    • Indians have higher risk of:
      • Diabetes
      • Heart disease
      • Insulin resistance
    [2024] Which one of the following is synthesised in human body that dilates blood vessels and increases blood flow 
    [A] Nitric oxide 
    [B] Nitrous oxide 
    [C] Nitrogen dioxide 
    [D] Nitrogen pentoxide
  • Advanced Agni Missile with MIRV System

    Why in the News

    India successfully conducted the flight-trial of an advanced Agni missile equipped with a Multiple Independently Targeted Re-entry Vehicle (MIRV) system on May 8, 2026. The test was carried out from Dr. A.P.J. Abdul Kalam Island.

    What is a Multiple Independently Targeted Re-entry Vehicle (MIRV)?

    • MIRV technology allows:
    • A single ballistic missile to carry multiple nuclear warheads
    • Each warhead to strike different targets independently

    How MIRV Works

    • Step 1: Missile Launch: A ballistic missile is launched carrying multiple warheads.
    • Step 2: Mid-course Phase: After reaching space or upper atmosphere:
      • The missile releases several re-entry vehicles
    • Step 3: Independent Targeting: Each warhead:
      • Follows a separate trajectory
      • Hits a different target
    [2026] Consider the following statements 
    1. Ballistic missiles are jet-propelled at subsonic speeds throughout their fights, while cruise missiles are rocket-powered only in the initial phase of fight. 
    2. Agni-V is a medium-range supersonic cruise missile, while BrahMos is a solid-fuelled intercontinental ballistic missile. 
    Which of the statements given above is/are correct? 
    [A] 1 only [B] 2 only [C] Both 1 and 2 [D] Neither 1 nor 2
  • Hypersonic Cruise Missile Scramjet Test 

    Why in the News

    Defence Research and Development Organisation (DRDO) successfully tested the actively cooled scramjet combustor of a new hypersonic cruise missile at the Scramjet Connect Pipe Test facility in Hyderabad.

    Key Achievement

    • DRDO achieved: 1,200 second runtime of the scramjet combustor
    • Previous successful test: 700 plus seconds in January 2026

    About Hypersonic Cruise Missile

    • Missile capable of travelling at:
      • More than Mach 5
      • Over five times the speed of sound
    • Approximate speed:
      • Above 6,100 km per hour

    What is a Scramjet Engine? 

    • Full Form: Supersonic Combustion Ramjet
    • Air breathing engine using:
      • Supersonic airflow during combustion
    • Operates efficiently at hypersonic speeds (Speed:5 Mach) 
    • Uses atmospheric oxygen instead of carrying oxidiser
    • Suitable for:
      • Hypersonic missiles
      • Advanced aerospace systems

    Countries Developing Hypersonic Technology

    • India
    • United States
    • Russia
    • China
    [UPSC 2009] In the context of Indian defence, consider the following statements: 
    1. The Shourya missile flies with a speed of more than 8 Mach. 
    2. The range of Shourya missile is more than 1600 km. 
    Which of the statements given above is/are correct? 
    (a) 1 only (b) 2 only (c) Both 1 and 2 (d) Neither 1 nor 2
  • Geocell 

    Why in the News

    CSIR-Central Road Research Institute (CSIR-CRRI) and Bharat Petroleum Corporation Limited (BPCL) were recognised by the India Book of Records and Asia Book of Records for constructing the first roadblock section using technical textile geocell made from end of life plastic.

    About Geocell

    • A three dimensional cellular confinement system used in geotechnical engineering
    • Designed to improve:
      • Soil stability
      • Load bearing capacity
      • Structural reinforcement

    Structure of Geocell

    • Consists of interconnected honeycomb shaped cells
    • Made from geosynthetic materials such as:
      • High Density Polyethylene (HDPE)
      • Polyester

    Working Mechanism

    • Cells are expanded on site to form a mattress like layer
    • Filled with materials such as: Soil, Sand, Aggregate, and Clay
    • After compaction:
      • The geocell integrates with underlying soil
      • Creates a reinforced and stable structure
    [2020] In rural road construction, the use of which of the following is preferred for ensuring environmental sustainability or to reduce carbon footprint? 
    1. Copper slag 
    2. Cold mix asphalt technology 
    3. Geotextiles Hot mix asphalt technology 
    4. Portland cement 
    Select the correct answer using the code given below: 
    a) 1, 2 and 3 only 
    b) 2, 3 and 4 only 
    c) 4 and 5 only 
    d) 1 and 5 only
  • Tactical Advanced Range Augmentation (TARA) 

    Why in the News

    Defence Research and Development Organisation (DRDO) and the Indian Air Force (IAF) successfully conducted the maiden flight trial of the Tactical Advanced Range Augmentation (TARA) weapon system off the coast of Odisha on May 7, 2026.

    About TARA (Tactical Advanced Range Augmentation)

    • It is India’s first indigenous glide weapon system
    • Purpose: Converts unguided warheads into precision guided weapons

    Developed By

    • Research Centre Imarat (RCI), Hyderabad
    • Along with other DRDO laboratories

    Key Features

    • Glide Weapon System: Uses aerodynamic lift to glide towards targets after launch
    • Enhances:
      • Accuracy
      • Lethality
      • Operational range
    • Low Cost Technology: Utilises state of the art low cost systems
    [2023] Consider the following statements 
    1. Ballistic missiles are jet-propelled at subsonic speeds throughout their fights, while cruise missiles are rocket-powered only in the initial phase of fight. 
    2. Agni-V is a medium-range supersonic cruise missile, while BrahMos is a solid-fuelled intercontinental ballistic missile. 
    Which of the statements given above is/are correct? 
    [A] 1 only [B] 2 only [C] Both 1 and 2 [D] Neither 1 nor 2
  • Cyborg Materials and Learning Metamaterials 

    Why in the News

    Researchers in Europe have developed a synthetic metamaterial capable of physically learning and changing shape in response to external conditions. The findings were published in the journal Nature Physics.

    About Metamaterials

    • Special engineered materials whose properties depend on:
      • Internal structure
      • Physical arrangement
      • Not just chemical composition
    • Can exhibit unusual properties not found in natural materials

    Key Features of the New Material

    • Built as a chain of connected robotic units
    • Each unit contains:
      • Motor
      • Angle sensor
      • Microcontroller
    • Capable of:
      • Learning shapes
      • Forgetting previous configurations
      • Adapting to new external conditions
    [2023] Consider the following actions: 
    1. Detection of car crash/collision which results in the deployment of airbags almost instantaneously
     2. Detection of accidental free fall of a laptop towards the ground which results in the immediate turning off of the hard drive 
    3. Detection of the tilt of the smart- phone which results in the rotation of display between portrait and landscape mode 
    In how many of the above actions is the function of accelerometer required? 
    [A] Only one [B] Only two [C] All three [D] None
  • Hantavirus and Andes Virus 

    Why in the News

    Health authorities in South Africa detected the Andes strain of hantavirus in passengers linked to a cruise ship outbreak off Cape Verde. The Andes virus is notable because it can spread from human to human in rare cases.

    About Hantavirus

    • A group of viruses mainly spread by:
      • Rodents
    • Humans may become infected through:
      • Contact with rodent urine, saliva, or droppings
      • Contaminated air particles

    Andes Virus

    • A specific strain of hantavirus
    • Found mainly in:
      • Argentina
      • Chile

    Symptoms of Hantavirus Infection

    • Fever
    • Muscle pain
    • Fatigue
    • Respiratory distress in severe cases
    [2015] Among the following, which were frequently mentioned in the news for the outbreak of Ebola virus recently? 
    (a) Syria and Jordan 
    (b) Guinea, Sierra Leone and Liberia
    (c) Philippines and Papua New Guinea 
    (d) Jamaica, Haiti and Surinam
  • Mexico City Subsidence and NISAR Satellite 

    Why in the News

    New imagery from the NISAR satellite has shown that Mexico City is sinking at an alarming rate of nearly 25 cm per year, mainly due to excessive groundwater extraction.

    What is Land Subsidence

    • Gradual sinking or settling of the Earth’s surface
    • Commonly caused by:
      • Excessive groundwater withdrawal
      • Mining
      • Natural geological processes

    Why is Mexico City Sinking

    • Built on an ancient lake bed
    • Heavy extraction of groundwater from aquifers
    • Rapid urbanisation and infrastructure load
    • Shrinking aquifers causing ground compaction

    About NISAR Satellite

    • NASA and Indian Space Research Organisation (ISRO) joint mission
    • Full Form: NASA ISRO Synthetic Aperture Radar

    Features of NISAR

    • Uses Synthetic Aperture Radar (SAR)
    • Can detect surface changes in real time
    • Works in:
      • Day and night
      • All weather conditions
    [2019] For the measurement/ estimation of which of the following are satellite images/remote sensing data used? 
    1. Chlorophyll content in the vegetation of a specific location 
    2. Greenhouse gas emissions from rice paddies of a specific location 
    3. Land surface temperatures of a specific location 
    Select the correct answer using the code given below. 
    [A] 1 only [B] 2 and 3 only [C] 3 only [D] 1, 2 and 3
  • [4th May 2026] The Hindu OpED: AI and a gathering storm of unchecked power

    PYQ Relevance[UPSC 2024] Social media and encrypting messaging services pose a serious security challenge. What measures have been adopted at various levels to address the security implications of social media? Also suggest any other remedies to address the problem.Linkage: The PYQ captures the article’s concern regarding technology-driven surveillance, data control, and threats to civil liberties, now amplified by AI systems. It highlights the broader issue of balancing technological innovation with regulation and democratic accountability, central to the article’s argument.

    Mentor’s Comment

    The article highlights a critical structural shift in global governance: the concentration of power in AI corporations without commensurate democratic oversight. It raises concerns about militarisation, surveillance, erosion of accountability, and weakening of constitutional safeguards, making it highly relevant for GS Paper II (governance, rights) and GS Paper III (technology, security).

    Is AI Concentrating Power in Private Corporations at the Cost of Democracy?

    1. Corporate Dominance: Centralises decision-making in firms like OpenAI, Anthropic, Palantir; reduces state oversight.
    2. Soft Power Erosion: Weakens democratic persuasion; replaces it with algorithmic influence over societies.
    3. Policy Vacuum: Lacks binding global frameworks; relies on voluntary corporate ethics.
    4. Example: OpenAI’s internal governance frameworks (e.g., “Claude’s Constitution”) replace statutory regulation.

    How is AI Transforming Warfare and Raising Ethical Concerns?

    1. Algorithmic Warfare: Enables automated targeting and surveillance operations.
    2. Civilian Risk: Increases collateral damage due to data biases and automation errors.
    3. Example: Palantir’s Maven system used in U.S. operations in Iran; reported deaths of 175-180 civilians.
      1. Palantir’s Maven Smart System (MSS) is an AI-enabled command-and-control platform that accelerates military decision-making by integrating satellite imagery, drone feeds, and sensor data into a single interface.
    4. Ethical Gap: Absence of accountability for AI-led decisions in conflict zones.

    Does AI-Driven Surveillance Threaten Civil Liberties?

    1. Mass Surveillance: Expands profiling capabilities through data aggregation.
      1. Example: In 2025, police in India used 2,700 AI-enhanced CCTV cameras to monitor crowd density, behavioral patterns, and cross-border movements at the Maha Kumbh festival, highlighting the expansion of pervasive, automated tracking in public spaces.
    2. Predictive Policing: Normalises algorithmic bias in law enforcement.
    3. Tracking and Targeted Surveillance: Use of AI tools by U.S. Immigration and Customs Enforcement (ICE) for tracking individuals.
    4. Privacy Erosion: Weakens safeguards; data collected without adequate consent frameworks.

    Are Self-Regulatory Frameworks by AI Firms Adequate?

    1. Internal Ethics Models: Introduces corporate-led governance (e.g., Claude’s Constitution).
    2. Limitations: Lacks enforceability and transparency.
    3. Conflict of Interest: Profit motives undermine ethical commitments.
    4. Example: Anthropic’s ethical framework defines acceptable AI behaviour without legal backing.

    What are the Broader Societal Impacts of AI Expansion?

    1. Labour Disruption: Automates creative and intellectual tasks.
    2. Creative Ownership Issues: Uses copyrighted content (novels, essays) without clarity on fair use.
    3. Human Identity Question: Challenges notions of creativity, effort, and originality.
    4. Environmental Impact: High energy consumption of AI models affects climate goals.

    Is Global Governance of AI Fragmented and Inadequate?

    1. Divergent Approaches: EU AI Act vs. India’s non-binding guidelines (2025).
    2. Global Inequality: Concentrates power in technologically advanced nations.
    3. Example: Brazil’s call for regulation at AI Impact Summit (2026).
    4. Multilateral Failure: Lack of binding international law on AI governance.

    What are the Risks of Treating AI Expansion as Inevitable?

    1. Policy Paralysis: Accepts corporate dominance as unavoidable.
    2. Ideological Trap: Mirrors Thatcher’s “There is no alternative” mindset.
    3. Democratic Erosion: Reduces scope for public debate and intervention.
    4. Outcome: Normalises unchecked technological expansion.

    Conclusion

    AI represents a structural shift in power comparable to industrial revolutions but with deeper implications for democracy and sovereignty. Effective governance requires binding regulations, global cooperation, and reassertion of democratic control over technology to prevent concentration of unchecked power.

  • How dual-use satellites are blurring the lines of modern space war

    Why in the News?

    There is a critical shift in the nature of modern warfare. The dual-use satellites power civilian life, but at the same time are increasingly becoming instruments of covert warfare. There is growing weaponisation of civilian space infrastructure without physical destruction. Unlike earlier conceptions of space war involving kinetic attacks, recent developments show a shift toward cyber-attacks, signal jamming, and spoofing, as seen during the Russia-Ukraine conflict (2022) where the Viasat KA-SAT network was disrupted, crippling communications across Europe. This marks a paradigm shift, from visible destruction to invisible disruption. 

    What are Dual-use satellites?

    1. They are platforms that serve both civilian/commercial and military/national security purposes, often simultaneously or interchangeably. 
    2. These technologies, such as Earth observation or communication satellites, provide commercial services (e.g., mapping, internet) while also supplying intelligence-grade imagery, navigation, and encrypted communications for defense forces.

    How are dual-use satellites transforming the nature of warfare?

    1. Dual-use infrastructure: Enables simultaneous civilian and military utilisation of GPS, broadband, and communication systems.
    2. Military integration: Facilitates intelligence gathering, surveillance, reconnaissance, and drone targeting.
    3. Operational dependency: Increases reliance of armed forces on commercial satellite constellations.
    4. Target ambiguity: Obscures distinction between legitimate military targets and protected civilian assets.
    5. Strategic leverage: Converts civilian systems into force multipliers without dedicated military deployment
    6. Example: Civilian GPS systems enabling precision-guided military operations

    Why does modern space conflict avoid physical destruction?

    1. Non-kinetic techniques: Utilises cyberattacks, signal jamming, spoofing, and hacking
    2. Debris avoidance: Prevents creation of orbital debris that can damage own satellites
    3. Cost efficiency: Reduces financial and technological burden compared to kinetic weapons
    4. Escalation control: Maintains conflict below threshold of overt war
    5. Reversibility: Allows temporary disruption instead of permanent destruction
    6. Example: Viasat KA-SAT cyberattack disrupted communications without physical damage.

    How does the invisibility of cyber warfare weaken deterrence?

    1. Attribution uncertainty: Limits ability to conclusively identify attackers
    2. Proxy warfare: Enables operations through third-party actors and intermediaries
    3. Evidentiary challenges: Lacks visible proof compared to physical attacks
    4. Delayed response: Slows decision-making for retaliation due to ambiguity
    5. Deterrence erosion: Weakens threat of retaliation as attackers remain unidentified
    6. Outcome: Encourages repeated low-intensity attacks below war threshold

    Why is the legal framework inadequate for space cyber warfare?

    1. Outer Space Treaty gap: Focuses on physical weaponisation, excludes cyber operations
    2. UN Charter ambiguity: Article 2(4) unclear on cyber disruptions as “use of force”
    3. International Humanitarian Law (IHL) limitations: Difficulty in applying civilian-military distinction in dual-use systems.
    4. Attribution requirement: Legal responsibility contingent on high evidentiary standards.
    5. Enforcement deficit: Absence of binding mechanisms for compliance and accountability
    6. Example: Cyberattacks on satellites fall outside clearly defined war thresholds

    How is the civilian-military distinction collapsing in space?

    1. Dual-use systems: Civilian satellites routinely support military operations
    2. Legal contradiction: IHL mandates distinction, but technology merges functions
    3. Operational overlap: Commercial constellations provide services to armed forces
    4. Target legitimacy confusion: Civilian assets become potential military targets
    5. Protection erosion: Reduces safeguards for civilian infrastructure
    6. Example: Commercial satellites used for intelligence and battlefield coordination

    What risks do cyber intrusions in space systems pose to society?

    1. Critical infrastructure exposure: Financial systems, aviation, and energy depend on satellites
    2. Cascading failures: Disruption in one system triggers failures across sectors
    3. Navigation risks: GPS spoofing misguides aircraft and maritime vessels
    4. Economic disruption: Interrupts banking, stock markets, and digital payments
    5. Governance paralysis: Affects emergency services and state communication networks
    6. Example: Communication blackout due to satellite cyberattack affecting multiple countries.

    Why is there a need for enforceable norms in space governance?

    1. Normative gaps: Existing frameworks remain advisory without enforcement
    2. Threshold ambiguity: Lack of clarity on what constitutes an act of war in cyberspace
    3. Attribution mechanisms: Requires international cooperation for real-time identification
    4. Collective security: Strengthens coordinated response to cross-border cyber threats
    5. Standardisation: Establishes clear operational and legal guidelines for space conduct
    6. Outcome: Reduces ambiguity and strengthens deterrence

    Conclusion

    Space warfare is evolving into a domain defined by invisible disruption, legal ambiguity, and systemic risk. The fusion of civilian and military systems creates vulnerabilities that extend beyond conflict zones into everyday life. Strengthening legal clarity, attribution capacity, and enforceable norms remains essential for maintaining stability in the space domain.

    PYQ Relevance

    [UPSC 2022] What are the different elements of cyber security? Keeping in view the challenges in cyber security, examine the extent to which India has successfully developed a comprehensive National Cyber Security Strategy.

    Linkage: The PYQ directly relates to cyber threats in critical infrastructure, now extended to space-based systems like satellites. It highlights gaps in attribution, deterrence, and regulatory frameworks, which are central to dual-use satellite warfare.