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Subject: Science and Technology

  • Scientists create 2D Metal Sheets using High-Pressure Technique

    Why in the News?

    A team of researchers from top Chinese scientific institutions has reported a major breakthrough in the creation of atomically thin 2D metal sheets using a novel high-pressure sandwich method.

    About the 2D Metal Created:

    • Definition: 2D metals are only one or two atoms thick, so electrons can move in just two dimensions.
    • Quantum Confinement: Electrons in 2D metals are restricted to specific energy levels, similar to how they behave in atoms.
    • Scientific Interest: Metals like bismuth, tin, and lead in 2D form are being studied for their electrical, magnetic, and quantum properties.
    • Applications: Their special properties make them useful for quantum computing, sensors, and advanced electronics.

    Technologies Involved:

    • Quantum Dots: These are tiny semiconductors where electrons are tightly confined, creating quantised energy states.
    • Quantum Confinement: In quantum dots, electrons can’t move freely in any direction, leading to discrete energy levels.
    • Link to 2D Metals: In 2D metals, electrons are confined in two dimensions, changing conductivity, magnetism, and optical behaviour.
    • Process: Chinese scientists created 2D metals by sandwiching metal powder between two MoS₂-coated sapphire layers.
    • Steps involved: The structure is heated, twisted, and pressed to form ultra-thin sheets, then cooled and peeled off.
    • Material Choice: MoS₂ and sapphire were chosen for their strength, smoothness, and low chemical reaction with metal.

    Note: 

    Quantum confinement occurs when a particle like an electron is trapped in an extremely small space, such as a nanoscale material. This restriction changes its energy levels, making them discrete instead of continuous. As a result, the material’s properties—like color and conductivity—can change with size.

     

    [UPSC 2012] Graphene is frequently in the news recently. What is its importance?

    1. It is a two-dimensional material and has good electrical conductivity.

    2. It is one of the thinnest but strongest materials tested so far.

    3. It is entirely made of silicon and has high optical transparency.

    4. It can be used as ‘conducting electrodes’ required for touch screens, LCDs and organic LEDs.

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

     

  • Chandrayaan-5 (LUPEX Mission) enters Preliminary Design Phase

    Why in the News?

    India and Japan have begun the preliminary design phase of the Chandrayaan-5 mission, also known as LUPEX (Lunar Polar Exploration).

    Back2Basics: Legacy of Chandrayaan Missions

    • Chandrayaan-1 (2008): First mission, focused on mineral and chemical mapping.
    • Chandrayaan-2 (2019): Orbiter mission with 98% success.
    • Chandrayaan-3 (2023): Achieved a historic soft landing on the Moon’s south pole.
    • Chandrayaan-4 (Upcoming, 2027):
      • It is a planned lunar sample return mission by ISRO, expected to launch around 2027, with the landing site near Statio Shiv Shakti at the lunar south pole.
      • The mission involves five modules launched on two LVM-3 rockets, later docked in Earth orbit to form an integrated spacecraft.
      • A robotic arm and drill will collect 2–3 kg of surface and sub-surface lunar samples for return to Earth.
      • The Re-entry Module (RM) will re-enter Earth’s atmosphere with the samples using ballistic re-entry, marking India’s first attempt at sample return.
    • Chandrayaan-5 / LUPEX: Aimed at deeper exploration with global participation.
    • Manned Lunar Mission: Prospected lunar landing by 2040.

    About Chandrayaan-5/LUPEX Mission:

    • It is a collaborative mission between ISRO and JAXA.
    • Approval: Cabinet approval for the mission was granted on March 10, 2025.
    • Launch: It will carry a 6.5-tonne payload and launch aboard Japan’s H3 rocket in 2027–28.
    • Collaboration: The lander is being developed by ISRO and the 350-kg rover by JAXA.
    • Duration: The mission is expected to last 100 days, with a possible extension of one year.
    • Mission Goals and Objectives:
      • Explore water and regolith in the lunar south pole’s Permanently Shadowed Regions (PSRs).
      • Drill into the Moon’s surface, analyse soil samples, and perform in-situ experiments.
      • Assess water content, quality, and analyse surface volatiles using advanced instrumentation.
      • Exploration of the far side of the Moon.

    Scientific Collaboration and Instruments:

    • A total of 7 scientific instruments will be onboard the mission.
    • ISRO’s Contribution: Development of the lander; creation of one sensor in a major four-sensor instrument.
    • JAXA’s Contribution: Development of the rover and three sensors in the same instrument; Rover is designed to climb 25° inclines and operate on a complex battery charging protocol.
    • ESA (European Space Agency): Developing a mass spectrometer.
    • NASA: Contributing neutron spectrometers.
    [UPSC 2009] In the context of space technology, what is Bhuvan, recently in the news?

    Options: (a) A mini satellite launched by ISRO for promoting the distance education in India (b) The name given to the next Moon Impact Probe, for Chandrayaan-II (c) A geoportal of ISRO with 3D imaging capabilities of India* (d) A space telescope developed by India

     

  • How did India develop genome edited rice?

    Why in the News?

    Union Agriculture Minister Shivraj Singh Chouhan recently said that India is the first country in the world to create rice varieties using genome editing technology.

    What are the new varieties?

    A team of researchers from different institutions, led by the Indian Council of Agricultural Research (ICAR), developed two new rice varieties — DRR Dhan 100 (called Kamala), made from the high-yielding Samba Mahsuri rice, and Pusa DST Rice 1, made from the Maruteru 1010 (MTU1010) variety.

    What are the benefits of the new rice varieties Kamala and Pusa DST Rice 1?

    • Higher Yield: Both varieties produce more rice per hectare than their parent strains. Eg: Kamala yields 5.37 tonnes/ha vs. Samba Mahsuri’s 4.5 tonnes/ha; Pusa DST Rice 1 yields 3,508 kg/ha, which is 9.66% more than MTU1010’s 3,199 kg/ha.
    • Drought Tolerance: Kamala is more resilient to drought, ensuring stable harvests during water shortages. Eg: Farmers can harvest good crops with less water in drought-prone areas using Kamala.
    • Early Maturity: Kamala matures 20 days earlier, reducing resource use and allowing faster crop cycles. Eg: Early harvest saves water and fertilizer, enabling farmers to grow a second crop sooner.
    • Salinity and Alkalinity Resistance: Pusa DST Rice 1 tolerates coastal salinity and alkaline soils better than its parent, boosting yield in tough environments. Eg: It yields 30.4% more under coastal salinity and 14.66% more under alkalinity than MTU1010.
    • Reduced Environmental Impact: Early maturity of Kamala lowers methane emissions from rice fields, helping fight climate change. Eg: Shorter growing period means less methane released compared to traditional rice varieties.

    Why are there objections to the genome-edited rice varieties?

    • Lack of Transparency: There is concern that the genome-edited rice varieties were announced without adequate field-level data being shared publicly, making the scientific claims appear premature. Eg: Venugopal Badaravada, a former ICAR governing body member, criticized the lack of transparency and was later expelled, raising concerns about institutional accountability.
    • Regulatory Concerns: Critics argue that exempting genome-edited crops (especially SDN-1 and SDN-2) from GM regulations is legally questionable and may bypass biosafety evaluations. Eg: The Coalition for a GM-Free India stated that de-regulating gene editing is “outright illegal” under India’s current biosafety framework.
    • Seed Sovereignty and Intellectual Property Rights (IPR): Activists fear that the gene-editing tools used are patented, which could threaten farmers’ seed rights and give control to private corporations. Eg: Concerns were raised about IPR entanglements with the technologies used in Kamala and Pusa DST Rice 1, potentially compromising India’s food and seed sovereignty.

    When will the new rice seeds be available for farmers?

    The Indian Council of Agricultural Research (ICAR) anticipates that certified seeds of these varieties will be available to farmers within two years, following the completion of necessary processes such as Intellectual Property Rights (IPR) registration and seed multiplication.

    Way forward: 

    • Ensure Transparent Evaluation: Conduct multi-location field trials and publicly share performance data to build scientific credibility and public trust.
    • Safeguard Farmer Rights and Regulatory Oversight: Develop a clear IPR policy and establish robust, independent biosafety review mechanisms to protect seed sovereignty and address legal concerns.

    Mains PYQ:

    [UPSC 2020] In what way have the science-based technologies triggered off striking changes in agriculture?

    Linkage: Genome editing is a science-based technology that represents a significant advancement capable of triggering changes in agriculture by developing improved crop varieties.

  • Scientists at CERN Create Gold from Lead

    Why in the News?

    In a recent breakthrough at CERN’s ALICE (A Large Ion Collider Experiment), scientists observed that near-collisions of lead ions in the Large Hadron Collider (LHC) can result in the formation of gold atoms and other novel nuclei.

    How was Lead converted into Gold?

    • In ultra-peripheral collisions at the Large Hadron Collider, lead atoms passed close without touching, creating strong electromagnetic fields.
    • These fields released photons that caused some lead atoms to lose 3 protons and 2 neutrons, transforming them into gold-203.
    • Between 2015–2018, 86 billion gold atoms were created—just 29 picograms—scientifically important but not commercially valuable.

    About the Large Hadron Collider (LHC):

    • The LHC has been working since September 2008 and is the world’s largest particle accelerator.
    • Development: Between 1998 and 2008 in collaboration with over 10,000 scientists, and hundreds of universities and laboratories across more than 100 countries.
    • Location: It lies in a 27-kilometre tunnel under the France–Switzerland border, near Geneva, and is operated by CERN.
    • Purpose: It smashes protons or lead atoms together to help scientists study the smallest building blocks of the universe.
    • Working Mechanism: About 9,600 magnets guide particles in a circle using strong magnetic fields.
    • Speed: Particles travel at 99.999999% the speed of light, creating conditions like the Big Bang.
    • Particles Studied: The LHC focuses on quarks (which come in six types) and gluons, which hold quarks together using the strong nuclear force.
    • Members: 24 countries spans across the Europe. Japan and US are Observer.
    • India and LHC: 
      • India signed a cooperation agreement with CERN in 1991 and joined its Large Hadron Collider project in 1996; it became an Associate Member in 2016 after gaining Observer status in 2002.
      • India also helped design LHC components such as superconducting magnets, cryogenic systems, and accelerator protection systems.

    About the ALICE Experiment:

    • ALICE is designed to study heavy-ion collisions, mainly using lead atoms.
    • Objective: It recreates matter similar to that formed just after the Big Bang, helping us understand the early universe.
    • Detection Range: ALICE can study both large particle blasts and rare, low-energy events with high precision.
    • Size and Setup: It weighs 10,000 tons, measures 26 × 16 × 16 metres, and sits 56 metres underground.
    • Members: As of 2024, ALICE includes over 1,900 scientists from 174 institutes across 39 countries, including India.
    • India’s Contribution: Key instruments like the Photon Multiplicity Detector for ALICE and the Hadron Outer Calorimeter for CMS.

     

    [UPSC 2009] In the year 2008, which one of the following conducted a complex scientific experiment in which sub-atomic particles were accelerated to nearly the speed of light?

    Options: (a) European Space Agency (b) European Organization for Nuclear Research* (c) International Atomic Energy Agency (d) National Aeronautics and Space administration

     

  • Asteroid YR4 might miss the Earth

    Why in the News?

    Asteroid YR4, discovered in December 2024 via Chile’s ATLAS telescope, was first thought to threaten Earth but was later ruled out. Scientists now focus on its potential Moon impact in 2032.

    Asteroid YR4 might miss the Earth

    About Asteroid 2024 YR4:

    • Asteroid 2024 YR4 was discovered in December 2024 by the ATLAS telescope located in Chile.
    • It is a near-Earth asteroid (NEA) whose orbit brings it within 1.3 AU (Earth-Sun distances) of Earth.
    • It is estimated to be 65 metres wide, roughly the size of a 10-storey building.
    • Initially, it was suspected to have a 3.1% chance of impacting Earth in 2032, triggering NASA’s highest-ever asteroid impact alert.
    • Subsequent tracking ruled out an Earth impact but indicated a 3.8% chance of hitting the Moon on December 22, 2032.
    • A Moon impact would create a 500 to 2,000-metre-wide crater and release energy 340 times more powerful than the Hiroshima bomb.
    • Despite being smaller than the 140m threshold for “potentially hazardous asteroids,” its unusual trajectory drew global scientific attention.
    • Scientists continue to observe YR4, including during a close approach in 2028, to refine its orbital predictions.

    Back2Basics: ATLAS Telescope

    • ATLAS (Asteroid Terrestrial-impact Last Alert System) is a NASA-funded early warning project for detecting small near-Earth objects (NEOs).
    • It is developed and operated by the University of Hawaii’s Institute for Astronomy.
    • As of 2025, ATLAS operates five telescopes in Hawaii, South Africa, Chile, and the Canary Islands.
    • Each telescope has a 0.5-meter Wright-Schmidt design, a 1-meter focal length, and a 110 MP CCD detector with a 7.4° field of view.
    • The system scans 20,000 square degrees of sky three times per night and provides 1–3 week warnings for asteroids 45–120 meters wide.
    • In addition to asteroids, ATLAS also discovers supernovae, comets, dwarf planets, and variable stars.

     

    [UPSC 2011] Comets show a perceptible glowing tail, while asteroids do not. Which of the statements given above is/are correct?

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

     

  • Gold’s Cosmic Origins from Magnetar Flares

    Why in the News?

    A new study by Columbia University, suggests that the universe may have an alternate mechanism for producing gold — not just in neutron star collisions, as previously believed, but also in magnetar flares.

    Gold's Cosmic Origins from Magnetar Flares

    What are Magnetars?

    • Magnetars are a rare type of neutron star with immensely strong magnetic fields, among the most powerful in the universe.
    • They are formed when a massive star collapses during a supernova, leaving a highly dense stellar core.
    • Due to magnetic instability, magnetars sometimes release intense flares of X-rays and gamma rays.
    • These flares can be millions of times stronger than typical solar flares.
    • A magnetar’s magnetic field is estimated to be about a thousand times stronger than that of ordinary neutron stars.

    r-Process in a Magnetar Flare:

    • The r-process (rapid neutron-capture process) forms heavy elements like gold, platinum, and uranium by rapidly attaching neutrons to atomic nuclei.
    • It was earlier believed to occur mainly in neutron star mergers.
    • In a 2024 study, scientists analysed a 2004 magnetar flare followed by delayed gamma-ray emissions, recorded by NASA’s Compton Gamma Ray Observatory.
    • The radiation patterns matched those of radioactive decay from r-process elements, suggesting neutron-rich nuclei were produced.
    • Around 1.9 septillion kilograms of matter was ejected at near-light speeds, marking the first direct evidence of r-process nucleosynthesis in a magnetar flare.

    Implications for Gold Formation:

    • The study shows that magnetar flares may also produce gold and other heavy elements, not just neutron star collisions.
    • This implies such elements could have formed earlier in the universe than previously believed.
    • The findings broaden our understanding of the origins of chemical elements in space.
    • It confirms that multiple astrophysical events contribute to the formation of heavy elements.
    • It also offers a new perspective on cosmic gamma-ray bursts and ancient stellar compositions.
    [UPSC 2012] Consider the following is/are cited by the scientists as evidence/evidences for the continued expansion of the universe?

    1. Detection of microwaves in space

    2. Observation of redshift phenomenon in space

    3. Movement of asteroids in space

    4. Occurrence of supernova explosions in space

    Select the correct answer using the code given below:

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

     

  • Scientists create first ‘Pangenome’ of Asian Rice

    Why in the News?

    Chinese researchers has developed a first-of-its-kind rice pangenome by integrating genetic data from 144 wild and cultivated rice varieties from Asia (similar to the Human Genome Project).

    About the Rice Pangenome:

    • A pangenome includes both the core genes shared by all members of a species and the unique genes found in specific varieties, offering a complete view of genetic diversity.
    • The rice pangenome was built using data from 144 wild and cultivated rice varieties across Asia, making it the first comprehensive genomic resource for rice.
    • Researchers led the project from the Chinese Academy of Sciences to explore rice evolution and domestication.
    • Researchers used PacBio HiFi sequencing and advanced computational tools to detect variations, uncovering 3.87 billion base pairs of genetic material previously missing from the standard rice genome.

    Key Findings:

    • The study identified 69,531 genes, including 28,907 core genes common to all varieties and 13,728 genes unique to wild rice.
    • About 20% of all genes were exclusive to wild rice, offering potential for trait improvement in cultivated varieties.
    • The study confirmed that all Asian cultivated rice (Oryza sativa L.) originated from Or-IIIa, a subgroup of Oryza rufipogon.
    • Japonica rice was first domesticated in China, while indica rice arose later via hybridization as japonica spread across Asia.
    • Wild-specific genes were linked to environmental adaptation, phenotypic flexibility, and regenerative traits, offering insights for future crop resilience.
    • Bridging the genetic gap between wild and cultivated rice could lead to climate-resilient and high-yield varieties.

    India’s Contribution:

    • Rice is India’s staple food and the main monsoon crop, grown from June to September.
    • In 2024–25, India produced a record 220 million tonnes of rice over 51,000 hectares, with an average yield of 4.2 tonnes per hectare.
    • The Indian Council of Agricultural Research (ICAR) has developed two genome-edited rice varieties — Samba Mahsuri and MTU 1010 — known for higher yields and drought resistance; these are currently under testing.
    [UPSC 2001] Assertion (A): Scientists can cut apart and paste together DNA molecules at will, regardless of the source of the molecules. Reason (R): DNA fragments can be manipulated using restriction endonucleases and DNA ligases.

    Options: (a) Both A and R are individually true and R is the correct explanation of A * (b) Both A and R are individually true but R is NOT a correct explanation of A (c) A is true but R is false (d) A is fasle but R is true

     

  • BrahMos: the ‘Fire and Forget’ Stealthy Cruise Missile 

    brahmos

    Why in the News?

    The BrahMos supersonic cruise missile has garnered global attention as it was reportedly used for the first time in a combat scenario during Operation Sindoor.

    About the BrahMos Missile:

    • BrahMos is a supersonic cruise missile jointly developed by India and Russia through BrahMos Aerospace.
    • The name is derived from the Brahmaputra River (India) and the Moskva River (Russia).
    • It is one of the world’s fastest cruise missiles, reaching speeds up to Mach 3.
    • It was first successfully tested on June 12, 2001, from Chandipur, Odisha.
    • It is a ‘fire and forget’ missile, requiring no further guidance after launch.
    • It can be launched from land, sea, air, and submarine platforms.
    • It has been inducted into the Indian Navy (2005), Army (2007), and Air Force (2017).
    • Key Features:
      • Classified as a stand-off weapon, it can be launched from a safe distance, avoiding enemy defences.
      • The original range was 290 km, now extended to 350–400 km, with future variants targeting 800 km and hypersonic speeds (Mach 5).
      • It offers high accuracy, extended seeker range, and 9 times more kinetic energy than subsonic missiles.
      • It operates in all weather conditions, day or night, and strikes both land and sea targets with precision.

    Anatomy of the BrahMos Missile:

    • BrahMos is a two-stage missile with advanced propulsion and stealth capabilities.
    • The first stage is a solid-propellant booster that accelerates the missile to supersonic speed.
    • The second stage uses a liquid-fuelled ramjet engine to sustain high-speed cruise up to Mach 3.
    • The ramjet is an air-breathing engine that combines liquid fuel with incoming air for efficient thrust.
    • It features stealth technologies, such as low radar cross-section and special materials.
    • The missile can cruise at up to 15 km altitude and descend to 10 metres in the terminal phase for pinpoint accuracy.
    • It supports multiple launch platforms, including mobile launchers, naval ships, Sukhoi-30 MKI aircraft, and submarines.

    Key Weapons and Systems used by India in Operation SINDOOR:

    Type Name Features & Role in Operation SINDOOR
    Air-Launched Missile SCALP (Storm Shadow) Long-range missile launched from Rafale jets; used for deep strikes on terror camps with minimal collateral damage.
    Precision-Guided Bomb HAMMER Modular weapon with 15–70 km range; delivered from aircraft to hit mid-range targets with high accuracy.
    Surface-to-Air Missile Akash Indigenous system that can engage multiple aerial targets simultaneously; intercepted enemy drones and missiles.
    Air Defence System SAMAR Rapid-response missile system for low-flying threats like UAVs and drones; bolstered India’s layered air defence.
    Anti-Drone System D-4 (Detect, Deter, Destroy) Uses radar, jammers, and laser weapons to disable or destroy hostile drones and UCAVs.
    Loitering Munition SkyStriker Kamikaze drone that hovers over targets before striking; used for precision attacks on enemy assets.
    Satellite Systems Cartosat, RISAT, EOS Series Provided real-time surveillance and intelligence for target tracking and mission planning.
    Navigation System NavIC India’s satellite-based navigation system; enabled sub-metre precision for missile and drone targeting.
    Anti-Aircraft Gun Upgraded L-70 (Bofors) Equipped with radar and auto-tracking; used to shoot down low-flying drones in conflict zones.

     

    [UPSC 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 flight.

    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?

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

     

  • Explained: How Air Defence Systems work

    Why in the News?

    Tensions between the two countries increased as Pakistan launched missiles and drones early Thursday to target 15 Indian military sites. In response, India hit air defence radars in Pakistan, neutralizing one in Lahore.

    What are the three main operations that constitute an effective air defence system?

    • Detection: The first step involves identifying incoming threats like aircraft, drones, or missiles using radars or satellites. Eg: India’s Rohini Radar can detect multiple aerial targets and is part of the Akash Air Defence System.
    • Tracking: Once a threat is detected, it must be tracked continuously using radar, infrared, or laser-based sensors to determine its speed, altitude, and trajectory. Eg: The S-400 Triumf uses advanced tracking radars to simultaneously monitor and engage multiple targets.
    • Interception: After detection and tracking, the threat is neutralized using fighter aircraft, surface-to-air missiles, or anti-aircraft artillery. Eg: India’s Akash missile system intercepts enemy aircraft or missiles at medium ranges.

    Why is the suppression of enemy air defence systems (SEAD) crucial for establishing air superiority?

    • Enables Safe Aerial Operations: Neutralising enemy air defences allows friendly aircraft to operate freely without the constant threat of being shot down. Eg: During the 1991 Gulf War, the U.S. first targeted Iraqi SAM sites to ensure air superiority.
    • Supports Ground Forces: Air superiority ensures effective air cover for ground troops, enabling safer movement, airstrikes, and supply drops. Eg: NATO SEAD missions in Kosovo helped protect allied ground forces from Serbian air defences.
    • Disrupts Enemy Command and Control: Destroying radar and communication nodes weakens the enemy’s ability to coordinate defences. Eg: Israeli SEAD missions against Syrian defences in 1982 crippled Syria’s radar and SAM systems early in the conflict.

    Which types of weapons are commonly used by nations to intercept and neutralise aerial threats?

    • Fighter Aircraft (Interceptors): Fast and agile aircraft used to engage enemy fighters and bombers in air-to-air combat. Eg: India’s Dassault Rafale jets can intercept and neutralise enemy aircraft using beyond-visual-range missiles.
    • Surface-to-Air Missiles (SAMs): Ground- or ship-based missiles that target aircraft, helicopters, or incoming missiles. Eg: The S-400 system can engage threats up to 400 km away with high precision.
    • Anti-Aircraft Artillery (AAA): High-rate-of-fire guns used as a last line of defence, particularly against low-flying targets.Eg: The L70 Bofors gun is used by India for low-altitude air defence.

    How do electronic warfare (EW) systems contribute to air defence without directly engaging enemy aircraft or missiles?

    • Radar Jamming: EW systems emit signals that interfere with enemy radar, making it difficult to detect or lock on to targets. Eg: The U.S. Navy’s EA-18G Growler jams enemy radar to protect allied aircraft.
    • Deception (Decoys): They send false signals to mislead enemy sensors, creating phantom targets or hiding real ones. Eg: DRDO’s “Samudrika” decoy system confuses enemy missile guidance.
    • Communication Disruption: EW tools disrupt enemy communication networks, limiting their coordination and response. Eg: Tactical jammers can cut off enemy ground-to-air communications during attacks.
    • Disabling Precision Weapons: EW can block or misguide the guidance systems of smart bombs and missiles. Eg: GPS jammers can prevent guided missiles from striking their intended targets.
    • Protection of Own Assets: EW defends friendly aircraft and installations by masking their electromagnetic signature. Eg: Su-30MKI fighters are equipped with EW suites to evade missile lock-ons.

    Where can surface-to-air missiles (SAMs) be launched from?

    • Land-Based Platforms: SAMs are commonly deployed on fixed launchers or mobile vehicles for ground defence. Eg: India’s Akash missile system is mounted on trucks for mobility and rapid deployment.
    • Naval Warships: SAMs are launched from warships to protect against aerial and missile threats at sea. Eg: The Barak-8 missile is deployed on Indian Navy destroyers like INS Kolkata.
    • Sub-surface or Strategic Facilities: Some strategic SAM systems are integrated into hardened, underground bunkers or launch silos for protection. Eg: S-400 systems are often placed in secure, semi-permanent launch sites for long-range interception.

    What are the different classes of SAMs used by India?

    • Long-Range SAMs: These systems are designed to engage high-altitude and long-range targets, including ballistic missiles and aircraft. Eg: The S-400 Triumf system, which has a range of up to 400 km, is a long-range SAM used by India to intercept aircraft and missiles.
    • Medium-Range SAMs: These systems are mobile and effective in engaging threats at intermediate ranges, typically between 50-100 km. Eg: The Akash missile system, developed by DRDO, is a medium-range SAM designed to protect tactical areas.
    • Short-Range SAMs (MANPADS): These are portable, man-carried systems used to defend against low-flying targets such as helicopters or drones. Eg: The Igla MANPAD, which is used by Indian forces for short-range air defence, can target low-flying aircraft and drones.

    Conclusion: India’s air defence system integrates advanced radar, tracking, and interception capabilities through various SAMs, including long, medium, and short-range systems, ensuring comprehensive protection against aerial threats across diverse platforms.

    Mains PYQ:

    [UPSC 2021] How is S-400 air defence missile system different from any other system presently available in the world?

    Linkage: Air defence systems are vital in modern warfare for controlling the skies and protecting against enemy air strikes, including missiles. Understanding how air defence systems generally work (detection, tracking, interception methods) is essential context for discussing the features and differences of a specific system like the S-400 missile system mentioned in the question. 

  • Kosmos 482 Mission

    Why in the News?

    A 500-kg piece of a Soviet spacecraft, part of the Kosmos 482 mission launched in 1972, is expected to crash back to Earth.

    About Kosmos 482 Mission:

    • Kosmos 482 was a Soviet space probe launched on March 31, 1972 as part of the Venera Program, aimed at exploring Venus.
    • It was launched just four days after its twin mission, Venera 8, which successfully landed on Venus 117 days later.
    • The mission’s goal was to:
      • Study Venus’s atmosphere and surface
      • Demonstrate technological and scientific superiority during the Cold War
    • Kosmos 482 was equipped with instruments to measure:
      • Temperature, pressure, and wind speed
      • Atmospheric gases and rock composition
      • Capable of transmitting data back to Earth
    • Venus was a target due to:
      • Speculation about life beneath its thick clouds
      • Its strategic importance in space exploration rivalry
    • Under the broader Venera Program (1961–1984):
      • 28 missions were launched toward Venus
      • 13 probes entered the atmosphere
      • 10 probes landed, but could only function for 23 minutes to 2 hours due to harsh surface conditions
    [UPSC 2014] Which of the following pairs is/are correctly matched?

    Spacecraft: Purpose

    1. Cassini-Huygens : Orbiting the Venus and transmitting data to the Earth.

    2. Messenger : Mapping and investigating.

    3. Voyager 1 and 2 : Exploring the outer solar system.

    Select the correct answer using the code given below.

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