UPSC Indian Science & Technology - Current Affairs (March 2026) PDF Download
GS3/Science and Technology
ALMA Telescope
Why in News?
Astronomers have recently utilized the ALMA telescope to capture the central region of our Milky Way with unprecedented detail, paving the way for significant discoveries in astrophysics.
Key Takeaways
- ALMA stands for Atacama Large Millimeter/submillimeter Array.
- It is located in the Atacama Desert in Chile, designed to study celestial objects at millimeter and submillimeter wavelengths.
- Operational since 2013, ALMA comprises 66 high-precision antennas that can be configured for various observational needs.
Additional Details
- Development: The telescope was developed through a collaboration among the U.S. National Radio Astronomy Observatory (NRAO), the National Astronomical Observatory of Japan (NAOJ), and the European Southern Observatory (ESO).
- Why Atacama Desert:
- Low Humidity: The Atacama Desert is the driest place on Earth, minimizing atmospheric water vapor absorption, which is critical for millimeter wave detection.
- High Altitude: Situated at over 5,000 meters, the thin atmosphere offers a clearer view of the universe.
- International Partnership: ALMA represents a global collaboration involving numerous countries:
- Europe: Contributions from various European countries.
- North America: The U.S. National Science Foundation (NSF) and the National Research Council of Canada.
- East Asia: Involvement from Japan's National Institutes of Natural Sciences (NINS), along with contributions from South Korea and Taiwan.
- Major Discoveries:
- Black Hole Imaging: ALMA was part of the Event Horizon Telescope (EHT) project that captured the first image of the supermassive black hole Sagittarius A* at the Milky Way's center.
- Protoplanetary Disks: The telescope captured detailed images of protoplanetary disks, such as around the star HL Tauri, significantly changing our understanding of planet formation.
- Einstein Ring: ALMA observed the bending of light from distant galaxies, providing insights that were previously unattainable.
In conclusion, the ALMA telescope stands as a monumental achievement in astronomical research, enhancing our understanding of the universe through its cutting-edge technology and international collaboration.
GS3/Science and Technology
Thorium and India's 100 GWe Nuclear Power Vision
Why in News?
The SHANTI Act 2025 represents a significant advancement in the expansion of India's nuclear energy sector, facilitating participation from both public and private sectors, as well as academia and industry. This initiative emphasizes the necessity for a robust regulatory framework. However, India's ambition to achieve a nuclear capacity of 100 GWe by 2047 is heavily contingent upon uranium imports, given the limited domestic reserves. To meet this goal, India would need approximately 18,000 to 20,000 tonnes of uranium annually, which raises concerns regarding long-term sustainability and the global competition for uranium resources.
Key Takeaways
- India's nuclear energy strategy is increasingly focusing on thorium utilization due to limited uranium resources.
- The SHANTI Act 2025 encourages participation from various sectors to enhance the nuclear energy landscape.
- India aims for a significant increase in nuclear power capacity by 2047, but faces challenges with uranium supply.
Additional Details
- Thorium Recycling: This approach presents a potential solution to the constraints posed by uranium supply. By recycling nuclear fuel, energy extraction can be enhanced significantly, reducing the reliance on uranium.
- India's Three-Stage Nuclear Programme:
- Stage I: Utilizes Pressurized Heavy Water Reactors (PHWRs) that operate on natural uranium to produce electricity and generate plutonium.
- Stage II: Involves Fast Breeder Reactors (FBRs) that produce more fissile material than consumed, essential for the final stage.
- Stage III: Focuses on thorium-based reactors, converting thorium-232 into uranium-233 for energy generation.
- The 500 MWe Prototype Fast Breeder Reactor is nearing completion, which is crucial for advancing thorium utilization.
- HALEU-thorium fuel can be integrated into PHWRs without major design modifications, providing benefits such as improved safety and reduced waste.
- There is a pressing need for accelerated irradiation testing and international collaboration to develop HALEU-thorium fuel.
In conclusion, with effective policy support and collaboration among government, industry, and academia, India can enhance its energy security and work towards achieving greater nuclear self-reliance, leveraging its vast thorium resources.
GS3/Science and Technology
What is Valles Marineris?
Why in News?
Recent research has revealed the formation of an unusual iron sulfate, specifically ferric hydroxysulfate, in layered deposits located near the extensive Valles Marineris canyon system on Mars. This discovery combines data from laboratory experiments with orbital observations.
Key Takeaways
- Valles Marineris is a vast system of interconnected canyons on Mars.
- It was discovered and named during the Mariner 9 mission in 1971.
- The canyon system is one of the largest in the solar system.
Additional Details
- Formation Features: The canyon walls exhibit fault scarps formed by crustal movements from the nearby Tharsis rise, which is a massive volcanic bulge located to the northwest.
- Erosion has significantly contributed to the canyon's formation, evidenced by deep gullies cut into the walls.
- There are thick sedimentary sequences in some canyons, indicating that they may have been filled with lakes in the past.
- These lakes might have drained catastrophically to the east, where signs of large floods have been observed.
This information about Valles Marineris provides crucial insights into the geological processes on Mars and highlights the potential for discovering new minerals and understanding the planet's history.
GS3/Science and Technology
Atomic Clock and India's NavIC System
Why in News?
The atomic clock onboard the IRNSS-1F satellite of India's NavIC navigation system recently failed, which has weakened the operational capacity of India's indigenous satellite navigation network.
Key Takeaways
- The atomic clock is crucial for precise timekeeping in satellite navigation.
- The failure of IRNSS-1F's atomic clock has reduced the operational satellites in NavIC, impacting navigation services.
Additional Details
- Atomic Clock: An atomic clock is a highly accurate timekeeping device that measures time based on the natural oscillations of atoms, typically caesium or rubidium atoms. Unlike traditional clocks, atomic clocks utilize the consistent frequency of atomic transitions to maintain extraordinary accuracy.
- Importance:Atomic clocks are fundamental for various applications such as:
- Satellite Navigation Systems: Navigation systems like GPS, GLONASS, Galileo, and BeiDou rely on atomic clocks for precise positioning.
- Precise Timekeeping: They define the international time standard known as Coordinated Universal Time (UTC).
- Telecommunication Networks: Accurate time synchronization is vital for mobile networks and internet communications.
- Scientific Research: They are essential in space science and physics experiments.
- The role of atomic clocks in satellite navigation is critical, as signals from satellites to receivers include precise timestamps that allow for accurate location calculation. Even a one-nanosecond error can translate to several centimeters of positional error.
- Status of NavIC System: Since its inception, nine IRNSS satellites have been launched, with several experiencing atomic clock failures. The IRNSS-1F satellite, launched in March 2016, ceased to function correctly in March 2026, limiting its services.
- Efforts to Strengthen NavIC: ISRO is working on launching improved navigation satellites, planning to use indigenously developed rubidium atomic clocks for future missions, moving away from previously imported models.
The failure of the atomic clock on the IRNSS-1F satellite highlights the need for ongoing advancements in satellite technology to ensure reliable navigation services. ISRO aims to address these challenges by deploying new satellites and enhancing existing systems.
GS3/Science and Technology
Acrylonitrile and Its Implications
Why in News?
Recent advancements in computer modeling have indicated that acrylonitrile, an organic compound found on Saturn's moon Titan, has the potential to self-assemble into structures similar to biological cells. This discovery could provide insights into the origins of life and the chemistry of extraterrestrial environments.
Key Takeaways
- Acrylonitrile is a man-made organic compound that can be produced from a catalytic reaction involving propylene and ammonia.
- This colorless liquid has a distinctive sharp odor reminiscent of onions or garlic and is highly volatile, quickly evaporating and forming flammable and toxic concentrations in the air.
Additional Details
- Properties: Acrylonitrile is a colorless liquid that dissolves in water and is heavier than air. Its volatility poses significant risks, as it can lead to explosive mixtures at room temperature, and its combustion results in toxic oxides of nitrogen.
- Applications: It is primarily utilized in the production of various chemicals, including plastics, synthetic rubber, and acrylic fibers. Historically, a mixture of acrylonitrile and carbon tetrachloride was used as a pesticide.
- Impact on Human Health: Exposure to acrylonitrile can irritate the skin, eyes, and respiratory system. Its toxicological effects can range from mild symptoms such as headaches and nausea to severe conditions including asphyxiation and cardiovascular collapse.
Understanding the properties and effects of acrylonitrile is crucial for its safe handling and potential applications, particularly in the context of its intriguing implications for life on other planets.
GS3/Science and Technology
The Evolving Diagnostic Landscape for Tuberculosis
Why in News?
Tuberculosis (TB) remains a significant public health challenge, especially in India. Recent advancements supported by the World Health Organization (WHO) have transformed TB diagnostics, enhancing detection and accessibility through innovative technologies. However, challenges in implementation and access still hinder effective TB elimination.
Key Takeaways
- Advancements in TB diagnostics include near point-of-care tests, molecular diagnostics, and AI-enabled tools.
- Mobile screening units have expanded access to TB testing in communities, particularly in underserved areas.
- Despite progress, gaps in access and research need to be addressed to achieve TB elimination goals.
Additional Details
- Technological Advancements: The introduction of near point-of-care (NPOC) tests, portable chest X-rays (CXR), and AI for screening has made TB testing faster and more accessible. AI can quickly identify suspicious lesions, which is crucial for early detection.
- Molecular Testing Evolution: India has transitioned from sputum smear microscopy to advanced nucleic acid amplification tests (NAAT), such as CBNAAT and Truenat, which improve diagnostic accuracy and reduce reliance on less effective methods.
- Comprehensive Diagnostic Strategy: A multifaceted diagnostic toolbox is essential, combining AI-enabled imaging and molecular tests tailored to different healthcare settings. Evidence-based research should guide implementation.
- Research Priorities: There is a need for cost-effective biomarkers for high-risk individuals, broader screening for asymptomatic TB, improved pediatric TB diagnosis, and better methods for detecting extra-pulmonary TB (EP-TB).
- Community Engagement: Increasing awareness and addressing screening hesitancy through community-led initiatives can enhance the uptake of diagnostics and preventive therapies.
Strengthening TB diagnostics presents significant benefits for public health, as early diagnosis leads to improved treatment outcomes, reduced transmission, and lower healthcare costs for affected families. India's evolving diagnostic ecosystem, bolstered by research and policy support, lays a strong foundation for TB elimination. Achieving these goals requires equitable access, efficient implementation, advanced research, and active community participation.
GS3/Science and Technology
Minor Planet Centre Announces Discovery of New Moons
Why in News?
The Minor Planet Centre (MPC) recently reported the discovery of 15 new moons in our solar system, including four moons orbiting Jupiter and eleven moons orbiting Saturn. This discovery is significant for the ongoing study of celestial bodies in our solar system.
Key Takeaways
- The MPC is the primary organization for tracking and cataloging observations of small bodies in the solar system.
- It operates under the Smithsonian Astrophysical Observatory and is affiliated with the International Astronomical Union.
- The center is located in Cambridge, Massachusetts, USA.
Additional Details
- Process of Discovery: When astronomers identify a new celestial object, they submit their data to the MPC. Experts at the MPC verify the observations and calculate the object's orbit. If the object is confirmed as a new discovery, it receives an official designation.
- Functions of the MPC: The MPC plays a crucial role in monitoring asteroids, comets, and moons of the outer planets. A key responsibility includes tracking near-Earth objects (NEOs) that may pose a threat to Earth. The MPC maintains an extensive database that helps scientists predict potential impacts from these rocks.
- The MPC enhances global scientific collaboration by publishing electronic circulars to inform researchers about new celestial discoveries and significant events.
In conclusion, the work of the Minor Planet Centre is vital for understanding and monitoring the dynamic nature of our solar system, particularly with the recent discoveries enhancing our knowledge about the moons of Jupiter and Saturn.
GS3/Science and Technology
National AI Skilling Initiative
Why in News?
The Union Minister for Information & Broadcasting has recently launched the National AI Skilling Initiative, which aims to bolster artificial intelligence (AI) capabilities in various creative sectors.
Key Takeaways
- Focus on strengthening AI skills in animation, visual effects, gaming, comics (AVGC), and media technology.
- Launched by the Ministry of Information and Broadcasting in collaboration with Google and YouTube.
- The initiative will provide training to participants from the creative and media industries.
Additional Details
- Implementation: The initiative is being implemented through the Indian Institute of Creative Technologies (IICT).
- Phases of Training:
- Phase I: Focuses on foundational AI learning through Google Career Certificates and Google Cloud Generative AI learning paths. Courses include AI Essentials, Prompting Essentials, Introduction to Generative AI, and Generative AI Leader Path. Successful completion is required to progress to the next phase.
- Phase II: Offers advanced, hands-on, and project-based specialization tailored for the creative industry, conducted in major cities across India.
- Significance: The initiative is designed to equip creators, media professionals, students, and developers with the skills necessary for future readiness in the evolving digital landscape.
This initiative reflects the government's commitment to fostering accessible technology and enhancing the digital content ecosystem in the country.
GS3/Science and Technology
SWOT Satellite
Why in News?
Recently, NASA created a new map of the ocean floor using data from the SWOT satellite.
About SWOT Satellite
- The Surface Water and Ocean Topography (SWOT) satellite was launched in 2022 as a joint mission between NASA and the French Space Agency, CNES.
- The objective of the SWOT satellite is to collect detailed measurements of how water bodies on Earth change over time.
Features of SWOT Satellite
- Ka-band Radar Interferometer (KaRIn): SWOT uses this specialized instrument to measure the height, width, and elevation of surface water bodies, including rivers, lakes, reservoirs, and oceans.
- High Spatial Resolution: The satellite bounces microwaves off water surfaces and calculates the return time, allowing it to track dynamic water movement with high precision.
- Global Flood Monitoring: SWOT covers over 55% of large-scale global floods during their lifecycle through its frequent Earth orbits.
- Comprehensive Scanning: The satellite can scan about 90% of the planet every 21 days, observing nearly all rivers wider than 330 feet and more than 1 million lakes and reservoirs larger than 5 acres.
- Detailed Surface Elevation Measurements: SWOT can measure fine differences in surface elevations around smaller currents and eddies, which are believed to play a significant role in the oceans' drawdown of heat and carbon.
GS3/Science and Technology
EV Battery Fires: The Science, the Risks, and the Indore Wake-Up Call
Why in News?
A devastating fire recently occurred in Indore, resulting in the tragic death of 8 individuals, including 2 children. The fire is suspected to have started from an electric vehicle (EV) charging point located outside the residence, prompting an official investigation.
Key Takeaways
- EV battery safety is under scrutiny following recent incidents.
- Understanding thermal runaway and its causes is crucial for improving safety measures.
- Industry and users must adopt better practices and technologies to minimize risks.
Additional Details
- Safety of EV Batteries: Most electric vehicles utilize lithium-ion batteries, which are also common in smartphones and laptops. These batteries are known for their high energy density and safety when managed correctly.
- Role of Battery Management System (BMS): EVs are equipped with a BMS that regulates temperature, ensuring the battery operates within safe limits during both charging and discharging.
- Risk of Thermal Runaway: This phenomenon occurs when one battery cell overheats, leading to a chain reaction that can overwhelm the cooling systems.
- Fire and Toxic Gas Risk: During thermal runaway, batteries can emit flammable and toxic gases, such as hydrogen fluoride, which escalate fire risks and complicate emergency situations.
- Physical Damage to Battery Pack: Impacts, particularly to the undercarriage, can compromise battery integrity, resulting in overheating and potential fire hazards.
- Overcharging and Faulty Chargers: Exceeding charging limits can create instability within the battery, and the use of non-approved chargers heightens this risk.
- Manufacturing Defects: Rare internal defects, such as metal protrusions, can cause short circuits and trigger thermal runaway.
- Electrical Infrastructure Issues: Outdated wiring and weak extension cords may not support sustained current, increasing fire risks during charging.
- Heat and Thermal Stress: High ambient temperatures can strain battery cooling systems, especially if vehicles are parked in direct sunlight or charged immediately after use.
- Battery Age and Maintenance: Aging batteries are more prone to failure, and neglecting regular inspections can conceal critical issues.
- Risk from Flooding: Water damage from flooding can lead to short circuits, with several EV fires reported following vehicle submersion.
- EV vs Petrol Vehicle Fires: While EVs are not uniquely hazardous-petrol vehicles catch fire more frequently-EV battery fires burn hotter and are more challenging to extinguish.
- Role of Surrounding Factors: External elements, such as nearby LPG cylinders or other vehicles, can heighten fire risks.
- Advanced Cooling Technologies: Innovations in cooling systems are underway, including evaporative cooling methods to enhance heat management.
- Safer Battery Design Innovations: The shift towards solid-state batteries aims to lower fire risks, incorporating internal firewalls to prevent fires from spreading.
- User-Level Safety Precautions: Users should employ only manufacturer-approved chargers, avoid overnight charging in unsafe setups, ensure electrical systems are adequate, inspect batteries after impacts, and allow cooling before charging.
- Strengthened Safety Standards in India: The Bureau of Indian Standards (BIS) has updated EV battery safety norms as of 2023, mandating rigorous testing for heat propagation and ensuring passenger evacuation protocols in case of fire.
In conclusion, while EV batteries present inherent safety risks, particularly related to thermal runaway, ongoing advancements in technology and user practices can significantly mitigate these hazards, ensuring a safer future for electric vehicle usage.
GS3/Science and Technology
Potential Disruption in Helium Supplies for India's Semiconductor and PCB Industry
Why in News?
The semiconductor and Printed Circuit Board (PCB) industry in India is facing possible disruptions in helium supplies due to recent geopolitical tensions following Iran's attack on Qatar's Ras Laffan LNG hub.
Key Takeaways
- Helium is an inert gas crucial for various industrial applications, especially in electronics.
- The gas has unique properties that make it irreplaceable in many technological processes.
Additional Details
- About Helium: Helium is an inert gas that does not react with other substances or combust. It was discovered in 1868 by Jules Janssen and Norman Lockyer through a yellow spectral line observed during a solar eclipse. The name is derived from the Greek word 'Helios', meaning Sun.
- Properties of Helium:
- Atomic Number: 2, making it the second lightest element after hydrogen.
- Very low boiling point of -268.9°C, allowing it to remain a gas in extremely cold conditions.
- Non-toxic but can displace oxygen, making it unsafe to breathe in isolation.
- Unique in that it cannot be solidified under normal atmospheric pressure, regardless of cooling.
- Largest Global Reserves: The major reserves of helium are located in the United States, Algeria, and Russia. Additionally, the Rajmahal Volcanic Basin in Jharkhand, India, is noted as a significant reservoir of helium that has been trapped for billions of years.
- Applications of Helium:
- Used for pressurizing fuel tanks in rockets, ensuring uninterrupted fuel flow to engines.
- Integral component of cooling systems in rockets and other high-performance technologies.
The looming shortage of helium poses a serious challenge to the electronics sector, highlighting the need for strategic reserves and alternative sources of this critical resource amidst rising geopolitical tensions.
GS3/Science and Technology
Cassava Brown Streak Disease
Why in News?
A recent study has raised concerns that over a third of Africa is vulnerable to Cassava Brown Streak Disease.
Understanding Cassava Brown Streak Disease
- Description: Cassava Brown Streak Disease (CBSD) is a severe illness that affects the production and quality of cassava roots, also known as tubers.
- Cause:The disease is caused by two types of viruses:
- Cassava Brown Streak Virus (CBSV)
- Ugandan Cassava Brown Streak Virus (UCBSV)
- History: CBSD was first identified in Africa, specifically in the coastal region of East Africa, around the mid-20th century. Since then, it has been confirmed in various countries across eastern, central, and southern Africa, including Tanzania, Uganda, Kenya, Rwanda, Burundi, Congo, the Democratic Republic of Congo (DRC), South Sudan, Malawi, and Zambia.
Spread of the Disease
- CBSD is primarily spread by the whitefly known as Bemisia tabaci. This pest exists as a complex of genetically distinct groups.
- The spread of CBSD is facilitated by specific populations of whiteflies in sub-Saharan Africa, particularly Sub-Saharan Africa 1 and 2, which are highly effective at transmitting the virus.
Symptoms of Cassava Brown Streak Disease
- Symptoms of CBSD can be seen on the leaves, stems, and roots of cassava plants.
- Leaf Symptoms: Leaf chlorosis (yellowing) is a common symptom.
- Stem Symptoms: Brown streaks may appear on the stems.
- Root Symptoms: Infected roots may experience dry hard rot, significantly impacting both the quality and quantity of edible storage roots.
- Necrosis: The disease causes necrosis (tissue death) in the roots of infected plants, often leading to complete crop loss.
- Accelerating Factors: Factors such as weak clean-seed systems, whitefly transmission, and climate pressures contribute to the rapid spread of CBSD.
Management of Cassava Brown Streak Disease
- The primary method of controlling CBSD is through the planting of clean cassava cuttings.
- The use of resistant varieties of cassava is considered the most sustainable way to manage and control CBSD over the long term.
GS3/Science and Technology
Alprazolam Production Bust in Andhra Pradesh
Why in News?
The Directorate of Revenue Intelligence (DRI) has recently uncovered an illegal facility producing Alprazolam in Andhra Pradesh, highlighting the ongoing issue of drug trafficking in the region.
Key Takeaways
- Alprazolam is classified as a psychotropic substance under the Narcotics, Drugs and Psychotropic Substances (NDPS) Act of 1985.
- This drug is part of the benzodiazepines group, commonly used to treat anxiety disorders.
Additional Details
- Alprazolam: This medication functions as a tranquillizing agent, primarily utilized for treating anxiety disorders, panic disorders, and anxiety related to depression.
- Benzodiazepines: These medications are central nervous system (CNS) depressants that work by enhancing the activity of the neurotransmitter gamma-aminobutyric acid (GABA) in the brain.
- Directorate of Revenue Intelligence (DRI): Established in 1957, the DRI serves as India's apex agency for anti-smuggling intelligence and investigations, focusing on curbing drug trafficking and other illicit trades.
- Functions of DRI: The agency is responsible for detecting and preventing smuggling, including drug trafficking and commercial frauds related to international trade.
- Nodal Ministry: The DRI operates under the Central Board of Indirect Taxes & Customs (CBIC), which is part of the Ministry of Finance, Government of India.
This incident underscores the persistent challenges posed by illegal drug production and trafficking, necessitating continued vigilance and enforcement efforts. The DRI's actions are crucial in combating these issues and ensuring public safety.
GS3/Science and Technology
Understanding Deinococcus radiodurans
Why in News?
Recent research has unveiled that the bacterium Deinococcus radiodurans, renowned for its exceptional resilience against extreme radiation and desiccation, can also endure the immense pressures encountered during planetary ejection, estimated between 14,000 to 24,000 times the atmospheric pressure on Earth.
Key Takeaways
- Radiation Resistance: D. radiodurans is best known for its remarkable ability to withstand ionizing radiation.
- Discovery: It was first identified in 1956 in irradiated canned meat.
- Nickname: Often referred to as "Conan the Bacterium" due to its extraordinary stress tolerance.
Additional Details
- Cell Characteristics: This bacterium is gram-positive, nonmotile, and exhibits a reddish hue.
- Mechanism of Resistance: Its resistance stems from a unique combination of metabolites and manganese, which form a potent antioxidant, enhancing its survival against radiation.
- DNA Repair: D. radiodurans possesses specialized mechanisms to repair its damaged DNA, including the enzyme thioredoxin reductase, which aids in repairing broken strands.
- Survival Techniques: It can eliminate damaged DNA portions and has backup copies of essential genes, enabling it to cope with extreme conditions like desiccation and starvation.
- Environmental Tolerance: This bacterium thrives in conditions of extreme cold, dehydration, vacuum, and even acidic environments.
In summary, Deinococcus radiodurans is a remarkable organism that showcases nature's ability to adapt to extreme environmental conditions, making it a subject of interest for scientific research and potential applications in biotechnology.
GS3/Science and Technology
New Species of Fruit Flies Identified
Why in News?
Entomologists have recently discovered two new species of fruit flies, named Acidoxantha paratotoflava and Hemilea suneriae, during a research expedition in the Himalayan foothills, specifically in the Solan region of Himachal Pradesh.
Key Takeaways
- Two new species of fruit flies have been identified.
- These species were discovered in the Solan region of Himachal Pradesh.
- The study marks the first record of the genus Rhagoletis in India.
- The male of the species Euphranta nigripeda was described for the first time since only the female was known.
Additional Details
- Acidoxantha paratotoflava: This species is medium-sized with a greenish-yellow appearance. It is characterized by:
- Four distinct black stripes on its thorax.
- Larger black spots on its abdomen.
- Unique "hook-like" structures in the male's anatomy.
- Hemilea suneriae: This species is a reddish-brown fly covered in prominent black dots. Notable features include:
- A unique wing pattern with a single clear "window" (hyaline indentation) in an otherwise dark area, unlike its relatives that typically have two.
- The study signifies a breakthrough in understanding the Rhagoletis genus, which is known to impact fruit crops globally.
- The identification of Euphranta nigripeda resolves a century-old mystery regarding its male counterpart.
This discovery enhances our knowledge of fruit fly biodiversity and their ecological significance in India.
GS3/Science and Technology
NavIC Atomic Clock Failure and India's GPS Ambitions
Why in News?
India's regional navigation system has encountered a significant setback following the failure of the atomic clock on the IRNSS-1F satellite. This malfunction has resulted in the loss of critical positioning data. While the satellite is still capable of providing messaging services, atomic clocks are vital for delivering precise navigation signals, which are essential for mapping, vehicle navigation, and infrastructure planning. The situation is further complicated by the NVS-02 replacement satellite, which failed to achieve its intended orbit, adversely impacting the overall positioning capabilities of the system.
Key Takeaways
- The IRNSS-1F satellite's atomic clock failure has compromised its positioning services.
- The NVS-02 satellite also encountered issues, affecting the NavIC system's effectiveness.
- Despite challenges, NavIC is vital for various sectors, including aviation, shipping, and railways.
Additional Details
- About IRNSS or NavIC: The Indian Regional Navigation Satellite System (IRNSS), also known as Navigation with Indian Constellation (NavIC), is designed to provide positioning services over India and up to 1,500 km beyond its borders. It consists of a planned seven-satellite constellation, similar to the U.S. GPS, aimed at delivering reliable navigation and timing information.
- Current Status: As of now, five satellites are operational within the NavIC constellation: IRNSS-1B, IRNSS-1C, IRNSS-1F, IRNSS-1I, and NVS-01. The failure of IRNSS-1F's atomic clock has reduced the number of satellites capable of providing positioning data.
- NVS-02 Satellite Failure: Launched in January 2025 as part of ISRO's 100th mission, NVS-02 was intended to enhance the NavIC system. However, it failed to reach its operational orbit due to an electrical malfunction that prevented the engine from igniting, following a failure in the signal required to activate the pyro valve.
- Delays in User Segment Development: The NavIC program has faced criticism for delays in developing user receivers. A CAG report from 2018 highlighted that while funding was approved in 2006, actual work did not commence until 2017, after several satellites had already been launched.
- Indigenous Atomic Clocks: A significant advancement has been the development of indigenous atomic clocks by ISRO, which diminishes reliance on foreign technology and addresses past issues affecting positioning accuracy.
- Global Navigation Systems: NavIC exists alongside other global systems such as GPS (USA), GLONASS (Russia), Galileo (Europe), and BeiDou (China), which provide widespread positioning, navigation, and timing services.
In summary, while the NavIC system is facing significant challenges due to satellite failures and technical issues, it remains an essential component of India's navigation capabilities, with ongoing efforts to enhance its reliability and expand its applications in various sectors.
GS3/Science and Technology
Adipose Tissue: A Dynamic Metabolic and Endocrine Organ
Why in News?
Recent scientific research has revealed that adipose tissue, commonly known as fat, is not merely a passive storage site for excess calories but functions actively as both a metabolic and endocrine organ.
Key Takeaways
- Adipose tissue is a connective tissue that exists throughout the body, serving various functions.
- It is categorized into different types: white, brown, and beige adipose tissues.
Additional Details
- White Adipose Tissue: This is the predominant type of fat in adults, primarily responsible for energy storage in the form of triglycerides.
- Functions:
- Releases hormones such as leptin, which helps in reducing appetite.
- Produces adiponectin, regulating insulin and blood sugar levels.
- Cushions internal organs and insulates the body against heat loss.
- Acts as a metabolic buffer, safely storing excess lipids.
- Contributes to health issues like insulin resistance, fatty liver disease, and cardiovascular risks.
- Brown Adipose Tissue: This specialized type of fat is designed to burn energy, containing a high number of mitochondria and the protein UCP1, which enables the direct conversion of chemical energy to heat.
- Beige Fat Cells: These cells develop within white fat depots under specific conditions, such as cold exposure or hormonal signals, acquiring some heat-producing characteristics similar to brown fat.
This understanding of adipose tissue highlights its complex role in metabolism and its potential implications for weight management and metabolic health.
GS3/Science and Technology
Legionnaire's Disease
Why in News?
Recent reports of Legionnaires' disease cases in London and New York have raised global concerns. Public health experts warn that densely populated cities, including those in India, may face similar risks if preventive measures are not strengthened.
Key Takeaways
- Legionnaires' disease is a serious lung infection caused by the bacterium Legionella.
- The disease was named after a 1976 incident at an American Legion convention where a group fell ill.
Additional Details
- Transmission:
- Legionella is naturally found in freshwater sources like lakes and rivers, as well as in soil.
- Most infections occur when individuals breathe in the bacteria from contaminated water or soil.
- It is important to note that the disease is not contagious and cannot be spread from person to person.
- Risk Factors:
- Older adults, individuals with weakened immune systems, and smokers are at a higher risk of developing Legionnaires' disease.
- Symptoms:
- Symptoms typically appear 2 to 14 days after exposure and may include fever, cough, shortness of breath, fatigue, headache, muscle pain, and gastrointestinal symptoms like abdominal pain and diarrhea.
- In severe cases, neurological symptoms (e.g., confusion) and respiratory failure may occur, which can be fatal.
- Treatment:
- Legionnaires' disease can be treated with antibiotics, though some individuals may still experience ongoing health issues after treatment.
- Currently, there is no vaccine available for this disease.
In conclusion, the recent outbreaks of Legionnaires' disease highlight the need for enhanced preventive measures, especially in densely populated areas, to mitigate the risks associated with this serious infection.
GS3/Science and Technology
Calcite, Characteristics, Formation, Uses, Importance
Introduction
- Calcite, a naturally occurring form of calcium carbonate (CaCO₃), is one of the most abundant and widely distributed minerals on Earth.
- It plays a crucial role in geology, industry, and biological systems. Calcite is found in sedimentary rocks like limestone and marble and is known for its unique crystal structure and remarkable physical properties.
About Calcite
- Calcite is a common mineral made of calcium carbonate (CaCO₃) and is a major component of rocks like limestone and marble.
- It is found in various environments, including sedimentary, metamorphic, and hydrothermal settings, and plays a significant role in both natural processes and human industries.
Physical Properties of Calcite
- Cleavage: Calcite shows perfect cleavage in three directions, resulting in rhomb-shaped fragments.
- Effervescence: When calcite reacts with dilute acids, it undergoes effervescence due to the release of carbon dioxide (CO₂).
- Double Refraction: Calcite exhibits double refraction, or birefringence, where it splits light into two rays, creating a double image.
Formation Processes of Calcite
- Biogenic Accumulation: Calcite forms from the accumulation of shells and skeletons of marine organisms, such as corals and mollusks, in sedimentary rocks.
- Precipitation in Caves: Calcite precipitates from calcium-rich water in caves, leading to the formation of stalactites and stalagmites.
- Metamorphic Process: During metamorphism, limestone is converted into marble, which involves the recrystallization of calcite.
- Hydrothermal Processes: Calcite can also form through hydrothermal processes from mineral-rich fluids.
Uses of Calcite
- Construction Industry: Calcite is widely used in the production of cement and lime, which are essential materials in the construction industry.
- Raw Material for Building Stones: Calcite serves as a raw material for producing marble and limestone building stones.
- Filler in Various Industries: Calcite is used as a filler in industries such as paper, plastic, paint, and rubber to enhance product quality and reduce costs.
- Agricultural Use: Calcite helps in agriculture by neutralizing acidic soils and improving soil fertility, making it suitable for crop cultivation.
Role in Carbon Cycle
- Carbon Sink: Calcite plays a vital role in the carbon cycle by acting as a long-term carbon sink, storing atmospheric carbon in sedimentary rocks over geological time scales.
- Carbon Release: During weathering and geological processes, calcite releases carbon dioxide back into the atmosphere, contributing to the carbon cycle.
Formation of Marine Organisms' Shells and Skeletons:
- Calcite is a fundamental component in the formation of shells and skeletons of marine organisms like corals and mollusks.
- These organisms use calcite to build their protective structures, which eventually contribute to sedimentary rock formation when they die and their remains accumulate.
Contribution to Karst Landscapes:
- Calcite is involved in the formation of karst landscapes, which are characterized by features like caves and sinkholes.
- As calcite-rich limestone dissolves over time, it creates underground voids and passages, leading to the development of caves and caverns.
- The continued dissolution and collapse of surface rock contribute to the formation of sinkholes, further shaping the karst landscape.
Regulation of Soil and Water Chemistry:
- Calcite plays a crucial role in maintaining ecological balance by regulating the chemistry of soil and water.
- It helps neutralize acidic conditions, making soil and water more conducive to plant and animal life.
- This regulation is essential for sustaining ecosystems and promoting biodiversity.
About Karst Topography
- Karst topography is a unique landscape formed by the dissolution of soluble rocks such as limestone, dolomite, and gypsum, primarily by carbonic acid.
- This process leads to the development of distinctive surface and underground landforms.
Formation Process
- Karst topography is created through the chemical weathering of limestone, dolomite, and gypsum by carbonic acid, which is formed when carbon dioxide mixes with water.
Characteristics
- Karst topography is characterized by underground drainage systems with minimal surface runoff.
- It features sinkholes (dolines) formed by the collapse or dissolution of rock, as well as the development of caves and caverns through continuous rock dissolution.
- Stalactites and stalagmites, formed by the deposition of calcium carbonate, are also common in karst landscapes.
- Other features include large depressions like poljes and limestone pavements with clints and grikes.
Importance
- Karst topography is ecologically and economically important for groundwater storage, tourism, and various processes in the carbon cycle.
- It provides a natural storage system for groundwater, supports diverse ecosystems, and attracts tourists for its unique geological formations.
FAQs on Indian Science & Technology - Current Affairs (March 2026)
| 1. What is the ALMA Telescope and its significance in astronomical research? |  |
| 2. How does thorium fit into India's nuclear power vision? | |
| 3. What is Valles Marineris and why is it important in planetary science? | |
| 4. What role does atomic clock technology play in India's NavIC system? | |
| 5. What are the implications of acrylonitrile in industrial applications? | |
