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Subject: Science and Technology

  • Fracture Discovered in a Cosmic Bone of the Milky Way

    Why in the News?

    NASA has released an image of a fractured structure in the Milky Way’s galactic centre. The feature, named G359.13, was captured using X-ray data from Chandra and radio data from South Africa’s MeerKAT array.

    Fracture Discovered in a Cosmic Bone of the Milky Way

    What is G359.13?

    • G359.13 is a long, linear structure near the centre of the Milky Way.
    • It is often referred to as a cosmic bone due to its shape and density.
    • It stretches about 230 light-years in length, making it one of the longest and brightest features of its kind in the galaxy.
    • It lies about 26,000 light-years from Earth, close to the Milky Way’s centre.
    • For context, over 800 stars exist within a radius of 230 light-years from Earth—the same length as this cosmic bone.

    New Discovery: A Fracture in G359.13

    • Astronomers identified a distinct break or fracture in the structure’s continuous body.
    • An X-ray and radio source was also detected precisely at the location of the fracture.
    • Scientists believe a pulsar—a magnetised, rotating neutron star—collided with G359.13.
    • The pulsar was likely moving at a speed of 1–2 million miles per hour at the time of impact.
    • The collision disrupted the structure, creating a visible fracture.

    Back2Basics: What is a Pulsar?

    • A pulsar is a neutron star that emits beams of electromagnetic radiation from its magnetic poles.
    • Though only about 20 km in diameter, it is more massive than the Sun.
    • Pulsars rotate extremely rapidly, some spinning hundreds of times per second.
    • When their radiation beam crosses Earth’s line of sight, we observe pulses of radiation, hence the name.

     

    [UPSC 2003] The time taken by the sun to revolve around the centre of our galaxy is

    Options: (a) 25 million years (b) 100 million years (c) 250 million years* (d) 500 million years

     

  • ‘Kamala’ and ‘Pusa DST Rice 1’ GM Rice

    Why in the News?

    India’s Agriculture Minister has introduced ‘Kamala’ and ‘Pusa DST Rice 1’, the country’s first genome-edited rice varieties, developed by ICAR. These are also the world’s first genome-edited rice varieties.

    About ‘Kamala’ and ‘Pusa DST Rice 1’:

    • Kamala (DRR Dhan 100): Developed by ICAR-IIRR Hyderabad, derived from Samba Mahsuri; shows higher yield, early maturity, drought tolerance.
    • Pusa DST Rice 1: Developed by ICAR-IARI Delhi, based on MTU1010; improves drought and salinity tolerance.
    • Agencies involved: Indian Council of Agricultural Research (ICAR), ICAR-IIRR, ICAR-IARI.
    • They were created using CRISPR-Cas9-based genome editing, specifically Site Directed Nuclease 1 (SDN1). It has NO foreign DNA inserted.
    • It has been approved by Institutional Biosafety Committees (IBC) and Review Committee on Genetic Manipulation (RCGM) under relaxed genome-edit rules.

    Specific Benefits Offered:

    • Yield boost:
      • Kamala: +19% over Samba Mahsuri (avg. 5.37 t/ha, max. up to 9 t/ha).
      • Pusa DST Rice 1: +9.6% to +30.4% over MTU1010 under stress conditions.
    • Climate resilience:
      • Kamala: Drought tolerance, early maturity.
      • Pusa DST: Salt and drought tolerance for saline/alkaline/coastal soils.
    • Water saving: Kamala matures 20 days early → saves 3 irrigations, i.e., 7,500 million m³ water.
    • Emission reduction: Cultivation over 5 million ha may reduce 32,000 tonnes GHG emissions (20% drop).
    • Food security support: Improved paddy output enhances India’s average yield, critical for 40% of total foodgrain basket.
    [UPSC 2018] With reference to the Genetically Modified mustard (GM mustard) developed in India, consider the following statements:

    1. GM mustard has the genes of a soil bacterium that give the plant the property of pest-resistance to a wide variety of pests.

    2.GM mustard has the genes that allow the plant cross-pollination and hybridization.

    3.GM mustard has been developed jointly by the IARI and Punjab Agricultural University.

    Which of the statements given above is/are correct?

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

     

  • ITER Tokamak Reactor

    Why in the News?

    Scientists working on the world’s largest nuclear fusion project ITER has completed its main magnet system with India playing a key role in building critical infrastructure.

    About ITER (International Thermonuclear Experimental Reactor):

    • ITER is the world’s largest nuclear fusion research project, aimed at demonstrating that nuclear fusion can be a safe, carbon-free, and sustainable energy source.
    • It involves 35 nations, including the EU, US, China, India, Japan, South Korea, and Russia.
    • It uses deuterium and tritium (hydrogen isotopes) to undergo fusion at temperatures over 150 million °C, 10 times hotter than the sun’s core, producing large amounts of energy.
    • Its goal is to achieve a fusion gain (Q) of 10, producing 500 megawatts of fusion power from just 50 megawatts of input heating power, a 10x gain.
    • Launched in 1985 and officially founded in 2006, the project began construction in 2007 and is expected to start its operations in 2033.
    • The tokamak is a doughnut-shaped magnetic fusion device used to contain the hot plasma required for nuclear fusion.
    • It uses powerful superconducting magnets to confine plasma and prevent it from touching the reactor walls.

    India’s Role in ITER/Tokamak:

    • India has been a full partner in ITER since 2005, contributing expertise and technology to key aspects of the project.
    • It has designed and manufactured the cryostat, a 30-meter-high, 30-meter-diameter vacuum shell made of stainless steel that houses the ITER tokamak and maintains the ultra-cold environment needed for superconducting magnets.
    • It has developed in-wall shielding to protect ITER’s components from heat generated during fusion reactions.
    • It provides cryogenic systems to cool the superconducting magnets and RF heating systems to heat the plasma to fusion temperatures.
    • It has contributed to developing the superconducting magnets, which are essential for plasma confinement inside the tokamak.

    Note:

    • India manages ITER-India, a project under the Institute for Plasma Research (IPR), overseeing key contributions, including diagnostics, power supplies, and other infrastructure.
    • It is also working on the development of a tritium breeding module for future fusion reactors, ensuring self-sufficiency in this critical fuel.

     

    [UPSC 2016] India is an important member of the ‘International Thermonuclear Experimental Reactor’. If this experiment succeeds, what is the immediate advantage for India?

    Options: (a) It can use thorium in place of uranium for power generation (b) It attain a global role in satellite-navigation (c) It can drastically improve the efficiency of its fission reactors in power generation (d) It can build fusion reactors for power generation*

     

  • Cosmic Clumpiness and the S8 Tension

    Why in the News?

    New research suggests that understanding the “clumpiness” of matter, measured by Sigma-8 (S8) Tension, could unlock key insights into the universe’s structure and complexity.

    What is S8?

    • S8 is a measure used by scientists to understand the distribution of matter across the universe, indicating how “clumpy” or evenly spread out the matter (like galaxies, stars, and dark matter) is.
    • High S8 tension means matter is clumped together in certain regions, while low S8 means it’s evenly distributed.
    • Scientists use S8 to study matter, including dark matter, which is invisible but makes up most of the universe.
    • The measurement of S8 helps explain how the universe fits together and has evolved since the Big Bang.
    • Recently, conflicting measurements of S8 have caused confusion, raising questions about our understanding of the universe.

    Implications for the ΛCDM Model:

    • The ΛCDM model (Lambda Cold Dark Matter) is the standard model explaining the universe’s structure, suggesting it’s mainly composed of dark matter and dark energy.
    • This model assumes that dark energy is causing the universe’s accelerating expansion.
    • S8 discrepancies may challenge the ΛCDM model, indicating a potential gap in our understanding of dark energy or dark matter.
    • Possible Implications:
      • Revised Theories: Scientists may need to adjust their model of the universe due to conflicting S8 values.
      • Re-thinking Dark Energy: If S8 measurements don’t align with predictions, dark energy might not behave as expected.
      • New Discoveries: The S8 tension could suggest undiscovered forces or particles influencing matter behavior.
      • Better Observations: Improved telescopes and surveys, like the Rubin Legacy Survey, may help clarify why S8 measurements conflict with predictions.
    [UPSC 2015] In the context of modern scientific research, consider the following statements about ‘IceCube’, a particle detector located at South Pole, which was recently in the news:

    (1) It is he world’s largest neutrino detector, encompassing a cubic km of ice. (2) It is a powerful telescope to search for dark matter. (3) It is buried deep in the ice. Which of the statements given above is/are correct?

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

     

  • New RNA-Based Approach to Combat Plant Viruses

    Why in the News?

    Recently, a team of scientists from Germany reported a breakthrough in combating the cucumber mosaic virus (CMV) through an innovative RNA-based antiviral agent.

    About Cucumber Mosaic Virus (CMV):

    • CMV is one of the most widespread and destructive plant viruses, affecting over 1,200 plant species, including important food crops such as cucumbers, melons, and cereals.
    • The virus is transmitted by aphids, tiny insects that spread the virus as they feed on plants, making outbreaks difficult to control.
    • In India, CMV causes significant yield losses in crops like bananas, pumpkins, and cucumbers, leading to mosaic discoloration, stunted growth, and unviable fruits.
    • The economic impact of CMV includes both direct financial losses from reduced crop yields and the indirect costs of pest management.

    RNA Silencing Methods discussed (HIGS vs SIGS): 

    RNA silencing is a natural defense mechanism that plants use to protect themselves from viral infections.

    Two RNA-based technologies, Host-Induced Gene Silencing (HIGS) and Spray-Induced Gene Silencing (SIGS), have been developed to enhance plant immunity against diseases like CMV.

    [1] Host-Induced Gene Silencing (HIGS):

    • HIGS involves genetically modifying plants to produce dsRNA, which activates the plant’s immune system to fight off the virus.
    • This method provides continuous protection and long-term immunity throughout the plant’s lifecycle.
    • However, it faces challenges such as regulatory issues, high production costs, and the potential for viruses to evolve resistance over time.

    [2] Spray-Induced Gene Silencing (SIGS):

    • SIGS, unlike HIGS, does not require genetic modification. Instead, plants are treated with RNA sprays containing dsRNA that targets specific viruses.
    • This method is cost-effective, non-GMO, and can be applied to a variety of crops.
    • However, SIGS provides short-term protection, may be ineffective due to random RNA mixtures, and its effectiveness can be reduced by environmental factors such as sunlight, rain, and soil microbes.
    [UPSC 2019] RNA interference (RNAi)’ technology has gained popularity in the last few years. Why?

    1. It is used in developing gene silencing therapies.

    2. It can be used in developing therapies for-the treatment of cancer.

    3. It can be used to develop hormone replacement therapies.

    4. It can be used to produce crop plants that are resistant to viral pathogens.

    Select the correct answer using the code given below:

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

     

  • DRDO achieves milestone in Scramjet Hypersonic Engine Development

    Why in the News?

    The DRDO Laboratory (DRDL), located in Hyderabad, successfully demonstrated long-duration Active Cooled Scramjet Subscale Combustor ground testing for over 1,000 seconds.

    About Hypersonic Cruise Missiles:

    • Hypersonic cruise missiles are advanced weapons capable of travelling at speeds greater than Mach 5 (approximately 6,100 km/h), making them 5x faster than the speed of sound.
    • These missiles use Scramjets (Supersonic Combustion Ramjets) powered by atmospheric oxygen, making them more efficient for long-duration travel compared to traditional missiles that carry their own oxidizers.
    • They maintain high speeds and are highly manoeuvrable, making them difficult to intercept by current missile defense systems.
    • They can strike targets at long ranges with minimal warning and penetrate advanced defense shields.

    DRDO’s Achievement:

    • The DRDO successfully conducted long-duration Active Cooled Scramjet Subscale Combustor ground testing for over 1,000 seconds.
    • This test advances India’s capability to develop hypersonic cruise missiles, validating the design of the scramjet combustor and the test facility, both crucial for developing air-breathing propulsion systems.
    • This paves the way for full-scale flight-worthy combustor testing, bringing India closer to developing functional hypersonic missiles and enhancing its defense capabilities.
    [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*

     

  • [pib] Measuring Helium Abundance in the Sun

    Why in the News?

    Researchers at the Indian Institute of Astrophysics (IIA) have successfully estimated the abundance of Helium in the Sun’s photosphere with precision for the first time.

    [pib] Measuring Helium Abundance in the Sun

    About Helium in the Sun’s Photosphere:

    • Helium is the second most abundant element in the Sun after Hydrogen and plays a key role in understanding solar composition, opacity, and energy transport.
    • However, measuring its precise abundance in the Sun’s photosphere has been challenging due to the absence of observable Helium spectral lines in visible light.
    • Traditionally, Helium abundance was estimated using indirect methods like extrapolating data from hotter stars, solar wind observations, and seismological studies of the Sun’s interior.
    • These methods lacked direct photospheric observations, making the estimates less accurate.
    • Accurate measurements of Helium are essential for modelling the Sun’s opacity and energy transport. This also has broader implications for understanding the composition of other stars.

    Novel Method Recently Discovered:

    • Researchers from the IIA introduced a novel method to directly estimate Helium abundance in the Sun’s photosphere.
    • This technique uses spectral features from Magnesium (Mg) and Carbon (C), overcoming the challenge of no direct Helium spectral lines.
    • Spectral lines from Mg, C, and hydrogenated molecules (MgH, CH, C2) were used to infer Helium abundance.
    • Equivalent Width analyses and spectrum synthesis techniques helped model the behavior of these elements in varying Helium-to-Hydrogen ratios.
    • The Helium-to-Hydrogen ratio in the Sun’s photosphere was found to be 0.1, consistent with previous studies. This confirms the validity of the new method.
    [UPSC 2023] Diffusion of light in the atmosphere takes place due to:

    Options: (a) Carbon dioxide (b) Dust particles* (c) Helium (d) Water vapors

     

  • Role of Lipids in Protein Function and Co-Evolution

    Why in the News?

    New research by CSIR-Centre for Cellular and Molecular Biology, Hyderabad suggest that lipids (along with DNA), particularly in mitochondrial membranes, are not just structural elements but play an integral role in the function and evolution of proteins.

    About Lipids and RC1 in Cells:

    Lipids:

    • Lipids, including fats, phospholipids, and sterols, make up to 30% of the dry weight of cells.
    • They are crucial for membrane integrity and various biological processes.
    • They vary in fatty acid composition and length, influenced by genetics, diet, and environmental factors.
    • They form a bilayer in membranes, with hydrophilic heads facing outward and hydrophobic tails inward, providing stability and enabling protein function.
    • Role of Lipids in Cells:
      • Lipids form the bilayer, providing flexibility and stability for membrane proteins that perform functions like receptor binding and ion channelling.
      • They like cardiolipin stabilize RC1 and other respiratory complexes, aiding energy production.

    RC1 (Respiratory Complex 1):

    • RC1 is a protein complex in the mitochondrial membrane, crucial for cellular respiration and energy production.
    • It is composed of 44 proteins, some synthesized in the cytoplasm and others in mitochondria.
    • Mutations in RC1 lead to diseases due to its vital role in respiration.

    Lipid-Protein Co-evolution as per new Research:

    • New research highlights the co-evolution of proteins and lipids, especially in mitochondrial membranes, where proteins interact with specific lipids from their own kingdom (plant or animal).
    • Plant lipids, richer in polyunsaturated fatty acids, are more flexible, aiding stress resistance, while animal lipids evolve differently to meet their needs.
    • Lipid-protein co-evolution adds complexity to cellular evolution, with implications for human health and disease treatment.
    [UPSC 2001] Which of the following cell organelles play the most significant role in protein synthesis?

    Options: (a) Lysosome and Centrosome (b) Endoplasmic reticulum and Ribosome* (c) Golgi apparatus and Mitochondria (d) Lysosome and Mitochondria

     

  • LEDA 1313424: The Bullseye Galaxy

    Why in the News?

    NASA’s Hubble Space Telescope recently discovered the Bullseye Galaxy (LEDA 1313424), which contains 9 rings, an unprecedented number.

    This finding offers new insights into galaxy evolution and the possibility of the galaxy evolving into a Giant Low Surface Brightness (GLSB) galaxy.

    Bullseye Galaxy

    About the Bullseye Galaxy (LEDA 1313424):

    • The Bullseye Galaxy is unique for containing 9 rings, an unprecedented number in the study of ringed galaxies.
    • Most ringed galaxies typically have 2 or 3 rings, making this discovery significant.
    • The rings are believed to have formed after a collision with a blue dwarf galaxy about 50 million years ago, causing ripples in the gas and creating star-forming regions that became the rings.
    • While individual stars’ orbits stayed the same, groups of stars gathered, forming distinct rings over time.
    • This discovery offers valuable insights into galaxy interactions and the rare formation of multiple rings.

    What are Giant Low Surface Brightness (GLSB) Galaxies?

    • GLSB Galaxies are large, diffuse galaxies with low surface brightness and fewer stars than typical galaxies, making them appear dimmer.
    • These galaxies contain vast hydrogen disks, the fuel for star formation, but their low hydrogen density prevents many stars from forming.
    • GLSB galaxies are believed to contain significant amounts of dark matter, affecting their mass distribution.
    • They have less dense inner regions and challenge current cosmological models due to their hydrogen content and low surface brightness.

    Bullseye Galaxy and Its Possible Evolution into a GLSB Galaxy:

    • It shares traits with GLSB galaxies, such as its extended disk and hydrogen content.
    • Researchers suggest that the Bullseye Galaxy might evolve into a GLSB galaxy, providing insights into the formation of such galaxies and the distribution of dark matter in the universe.
    [UPSC 2018] Consider the following phenomena:

    1. Light is affected by gravity. 2. The Universe is constantly expanding. 3. Matter warps its surrounding space-time.

    Which of the above is/are the prediction/predictions of Albert Einstein’s General Theory of Relativity, often discussed in the media?

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

     

  • What is a Quantum Gravity Gradiometer (QGG)?

    Why in the News?

    NASA scientists have proposed using quantum technology to study gravitational changes on Earth by deploying a quantum gravity gradiometer (QGG) on a satellite in low-Earth orbit.

    About Gravity Gradiometer & Quantum Gravity Gradiometer (QGG):

    • A gravity gradiometer measures small variations in gravitational force over short distances.
    • How It Works: It detects differences in the acceleration of falling objects, indicating the density of materials below the surface, such as hydrocarbon deposits or geological structures.
    • Applications:
      • Oil Exploration: Detects underground hydrocarbon deposits by measuring gravitational differences.
      • Geological Studies: Used to explore subterranean features like minerals and fault lines.
    • A Quantum Gravity Gradiometer (QGG) uses quantum technology to achieve much higher precision than traditional gravity gradiometers.
      • How It Works: Atoms are cooled to near absolute zero and manipulated with lasers. The phase shifts of these atoms, proportional to gravitational force, detect tiny changes in gravitational acceleration.
      • It can detect changes as small as 10^-15 m/s² over just 1 meter, offering much finer measurements than traditional instruments.
    • Specifications: Weighs 125 kg, has a volume like a 250-liter oil drum, and consumes 350 watts of power (comparable to an older Intel CPU).

    Applications of QGG in Space:

    • Studying Gravitational Variations: Measures small changes in Earth’s gravitational field, aiding climate change studies, such as melting ice caps and shifting water reserves.
    • Earth’s Gravitational Field Mapping: Improves understanding of Earth’s internal structure and seismic activities.
    • Dark Matter Research: Provides insights into dark matter by detecting gravitational anomalies.
    • Satellite Navigation: Enhances space navigation and satellite positioning.
    • Mapping Underground Features: Used to map structures like mineral deposits and fault lines.
    • Security: Detects underground structures like military bunkers and natural disasters, offering valuable security information.
    [UPSC 2003] If the radius of the Earth were to shrink by one per cent, its mass remaining the same, the value of ‘g’ on the Earth’s surface would:

    Options: (a) Increase by 0.5% (b) Increase by 2% (c) Decrease by 0.5% (d) Decrease by 2%