Latest news with #PSLV-C61
Indian Express
23-07-2025
- Science
- Indian Express
Daily subject-wise quiz : Science and Technology MCQs on Europa moon, chromosphere, NISAR mission and more (Week 120)
UPSC Essentials brings to you its initiative of subject-wise quizzes. These quizzes are designed to help you revise some of the most important topics from the static part of the syllabus. Attempt today's subject quiz on Science and Technology to check your progress. 🚨 Click Here to read the UPSC Essentials magazine for July 2025. Share your views and suggestions in the comment box or at With reference to the NISAR mission, consider the following statements: 1. It is an Earth observation satellite jointly developed by NASA and ISRO. 2. The satellite will be launched on the PSLV-C61 and put in a sun-synchronous orbit. 3. The satellite will scan the entire globe every 30 days, providing a series of very detailed images of the Earth's surface. 4. It will be the first satellite ever to observe the Earth in two frequencies. How many of the statements given above are correct? (a) Only one (b) Only two (c) Only three (d) All four Explanation — The much-awaited launch of NISAR — an earth observation satellite jointly developed by NASA and ISRO — is set to take place on July 30 at 5:40 pm from the country's only spaceport in Sriharikota, Andhra Pradesh. Hence, statement 1 is correct. — The satellite will be launched on the GSLV-F16 and be put in a 734 km sun synchronous orbit — an orbit in which the satellite reaches over a place at the same time each day. Hence, statement 2 is not correct. — The satellite will scan the entire globe every 12 days, providing a series of very detailed images of the Earth's surface. Hence, statement 3 is not correct. — NISAR, which stands for NASA-ISRO Synthetic Aperture Radar, will provide an unprecedented view of the planet. Weighing 2,392 kg it will be the first satellite ever to observe the Earth in two frequencies — NASA's L-band and ISRO's S-band. 'Each system's signal is sensitive to different sizes of features on Earth's surface, and each specializes in measuring different attributes, such as moisture content, surface roughness, and motion,' according to NASA. Hence, statement 4 is correct. Therefore, option (b) is the correct answer. With reference to the chromosphere, consider the following statements: 1. It is a region sandwiched between the sun's atmosphere (the million-degree corona) and the photosphere (the sun's visible surface). 2. It is in the chromosphere where the solar flares, hot plasma jets, and powerful energy fluxes originate. Which of the statements given above are correct? (a) 1 only (b) 2 only (c) Both 1 and 2 (d) Neither 1 nor 2 Explanation — Solar physicists will make a new attempt to observe the chromosphere of the sun, which is the most dynamic region. NASA, along with a team of international solar physicists, will launch a sounding rocket experiment on July 18 from New Mexico. — Reddish in colour, the chromosphere is a region sandwiched between the sun's atmosphere (the million-degree corona) and the photosphere (the sun's visible surface). It is in the chromosphere where the solar flares, hot plasma jets, and powerful energy fluxes originate. The temperature variations recorded along this region can vary between 6000 degrees Celsius and over a million degrees Celsius. Hence, statements 1 and 2 are correct. — The suborbital sounding rocket experiment will last under ten minutes. On board will be the Solar EruptioN Integral Field Spectrograph (SNIFS) – a solar-gazing spectrograph solar gazing spectrograph. Therefore, option (c) is the correct answer. Consider the following statements about MiG-21 fighter jets: 1. The Indian Air Force (IAF) is set to retire the remaining Russian-origin MiG-21 fleet in a ceremonial decommissioning on September 19 at the Chandigarh airbase. 2. There are five squadrons of the MiG-21 Bisons currently active. Which of the statements given above is/are correct? (a) 1 only (b) 2 only (c) Both 1 and 2 (d) Neither 1 nor 2 Explanation — After protecting the Indian skies through all major conflicts over more than six decades, the legendary MiG-21 fighter jets are set to retire in September. — The Indian Air Force (IAF) will ceremonially decommission the last Russian-origin MiG-21 fleet on September 19 at the Chandigarh airport. Hence, statement 1 is correct. — Two squadrons of MiG-21 Bisons are currently operational. Hence, statement 2 is not correct. — Since the aircraft's introduction into the IAF in 1963, India has purchased around 700 MiG-21s in various variants, including the Type-77, Type-96, BIS, and Bison. — The retirement of the ageing MiG-21 fleet was originally scheduled for 2022, but was postponed due to a delay in the planned induction of additional fighter jets, including the indigenous Light Combat Aircraft Tejas, which will replace the MiG-21 squadrons. Therefore, option (a) is the correct answer. Which of the following viruses is also known as the 'bleeding eye' virus? (a) Marburg virus (b) Avian influenza (c) Hepatitis B virus (d) Hepatitis E virus Explanation — MVD, sometimes known as the 'bleeding eye virus,' is one of the worst diseases capable of infecting humans. Case mortality rates in previous outbreaks ranged from 24% to 88%, depending on the virus type and case care. The first incidence in Rwanda this year was recorded in September. — Marburg is a filovirus, just like Ebola. Both infections are clinically identical and, while rare, can generate high-fatality epidemics. — The first recognised MVD outbreak occurred in Marburg, Germany, in 1967. Following that, successive outbreaks have largely been recorded throughout Africa, most recently in Tanzania, Ghana, and now Rwanda. — The World Health Organisation has listed MVD as one of the infections that pose the greatest hazard to public health and for which no suitable treatments or vaccinations exist. Therefore, option (a) is the correct answer. Consider the following: 1. Sulphur compounds 2. Helium gas 3. Argon gas 4. Pyroclastic debris How many of the following are products of volcanic eruptions? (a) Only one (b) Only two (c) Only three (d) All four Explanation — Volcanoes can be on land and in the ocean. They are formed when material significantly hotter than its surroundings is erupted onto the surface of the Earth. The material could be liquid rock (known as 'magma', when it's underground and 'lava' when it breaks through the surface), ash, and/or gases. — Magma refers to the material found in the upper mantle. When it begins to move towards the crust or reaches the surface, it is known as 'lava.' — Lava flows, pyroclastic debris, volcanic bombs, ash and dust, as well as gases such as nitrogen compounds, sulphur compounds, and trace amounts of chlorine, hydrogen, and argon, all make their way to the ground. — Helium is not a product of volcanic eruptions. Therefore, option (c) is the correct answer. Consider the following statements regarding Europa (one of the moon of Jupiter) Statement I : Europa, one of Jupiter's moons, is considered a strong candidate in the search for extraterrestrial life. Statement II : The James Webb Space Telescope has detected carbon dioxide and crystalline water ice on Europa's surface, indicating recent exposure of subsurface ocean material. Which one of the following is correct? (a) Both Statement-I and Statement-II are correct and Statement-II is the correct explanation for Statement-I (b) Both Statement-I and Statement-II are correct and Statement-II is not the correct explanation for Statement-I (c) Statement-I is correct but Statement-II is incorrect (d) Statement-I is incorrect but Statement-II is correct Explanation — Europa is widely regarded as one of the most promising places in our solar system to search for signs of life due to its subsurface ocean and signs of active geology. Hence, statement 1 is correct. — James Webb Space Telescope observations confirmed the presence of crystalline water ice, carbon dioxide, and sodium chloride on Europa's surface—especially in areas like Tara Regio—suggesting that material from the subsurface ocean is reaching the surface. Hence, statement 2 is correct. — These findings support the idea that Europa may have the chemical and physical conditions necessary for life, making the Statement II a correct explanation for the Statement I. Both Statement-I and Statement-II are correct and Statement-II is the correct explanation for Statement-I Therefore, option (a) is the correct answer. CoinDCX, recently in the news, is related to: (a) A government digital payment initiative (b) A space-tech startup collaborating with ISRO (c) A cryptocurrency exchange that suffered a major hack (d) A fintech app launched by RBI for rural banking Explanation — CoinDCX, Mumbai‑based crypto exchange, lost US $44.2 million from an internal operational wallet hack on July 19, 2025, discovered 17 hours later by blockchain investigator ZachXBT. — It marks India's second major crypto hack in one year, reinforcing the urgency for stronger cybersecurity protocols and regulatory standards in the digital asset domain. Therefore, option (c) is the correct answer. With reference to the NASA's sounding-rocket mission, consider the following statements: 1. The instrument SNIFS is designed to study the Sun's chromosphere, which lies between the photosphere and the corona. 2. SNIFS will capture 3D spectroscopic data, obtaining a full spectrum for each pixel in view. 3. The mission will measure the hydrogen Lyman‑α spectral line, a key diagnostic tool for chromospheric conditions. 4. SNIFS is an orbital satellite mission scheduled to operate for several years. Which of the statements given above are correct? (a) 1 and 2 only (b) 1, 2 and 3 only (c) 2, 3 and 4 only (d) 1, 2, 3 and 4 Explanation — SNIFS (Solar EruptioN Integral Field Spectrograph) will study the chromosphere, the dynamic layer sandwiched between the Sun's visible surface (photosphere) and the outer corona. Hence, statement 1 is correct. — It is the first ultraviolet integral field spectrograph to fly for solar study, providing 3D data sets where each pixel carries its own spectrum. Hence, statement 2 is correct. — SNIFS targets the Lyman-α spectral line of hydrogen, the brightest line in the solar ultraviolet spectrum, crucial for diagnosing chromospheric temperature, velocity, and density. Hence, statement 3 is correct. — SNIFS is a suborbital sounding‑rocket experiment, not a satellite mission; it will operate for under 10 minutes, not years. Hence, statement 4 is not correct. Therefore, option (b) is the correct answer. Daily Subject-wise quiz — History, Culture, and Social Issues (Week 118) Daily subject-wise quiz — Polity and Governance (Week 120) Daily subject-wise quiz — Science and Technology (Week 119) Daily subject-wise quiz — Economy (Week 119) Daily subject-wise quiz — Environment and Geography (Week 119) Daily subject-wise quiz – International Relations (Week 119) Subscribe to our UPSC newsletter and stay updated with the news cues from the past week. Stay updated with the latest UPSC articles by joining our Telegram channel – IndianExpress UPSC Hub, and follow us on Instagram and X. Manas Srivastava is currently working as Senior Copy Editor with The Indian Express (digital) and leads a unique initiative of IE - UPSC Essentials. He majorly writes on UPSC, other competitive exams and education-related projects. In the past, Manas has represented India at the G-20 Youth Summit in Mexico. He is a former member of the Youth Council, GOI. A two-time topper/gold medallist in History (both in graduation and post-graduation) from Delhi University, he has mentored and taught UPSC aspirants for more than five years. His diverse role in The Indian Express consists of writing, editing, anchoring/ hosting, interviewing experts, and curating and simplifying news for the benefit of students. He hosts the YouTube talk show called 'Art and Culture with Devdutt Pattanaik' and a LIVE series on Instagram and YouTube called 'LIVE with Manas'.His talks on 'How to read a newspaper' focus on newspaper reading as an essential habit for students. His articles and videos aim at finding solutions to the general queries of students and hence he believes in being students' editor, preparing them not just for any exam but helping them to become informed citizens. This is where he makes his teaching profession meet journalism. He is also the editor of UPSC Essentials' monthly magazine for the aspirants. He is a recipient of the Dip Chand Memorial Award, the Lala Ram Mohan Prize and Prof. Papiya Ghosh Memorial Prize for academic excellence. He was also awarded the University's Post-Graduate Scholarship for pursuing M.A. in History where he chose to specialise in Ancient India due to his keen interest in Archaeology. He has also successfully completed a Certificate course on Women's Studies by the Women's Studies Development Centre, DU. As a part of N.S.S in the past, Manas has worked with national and international organisations and has shown keen interest and active participation in Social Service. He has led and been a part of projects involving areas such as gender sensitisation, persons with disability, helping slum dwellers, environment, adopting our heritage programme. He has also presented a case study on 'Psychological stress among students' at ICSQCC- Sri Lanka. As a compere for seminars and other events he likes to keep his orating hobby alive. His interests also lie in International Relations, Governance, Social issues, Essays and poetry. ... Read More
The Hindu
06-06-2025
- Business
- The Hindu
Private lunar lander from Japan crashes into moon in failed mission
A private lunar lander from Japan crashed while attempting a touchdown Friday (June 6, 2025), the latest casualty in the commercial rush to the moon. The Tokyo-based company ispace declared the mission a failure several hours after communication was lost with the lander. Flight controllers scrambled to gain contact, but were met with only silence and said they were concluding the mission. Also Read | PSLV-C61/EOS-09 mission could not be accomplished: ISRO Communications ceased less than two minutes before the spacecraft's scheduled landing on the moon with a mini rover. Until then, the descent from lunar orbit seemed to be going well. CEO and founder Takeshi Hakamada apologized to everyone who contributed to the mission, the second lunar strikeout for ispace. Two years ago, the company's first moonshot ended in a crash landing, giving rise to the name 'Resilience' for its successor lander. Resilience carried a rover with a shovel to gather lunar dirt as well as a Swedish artist's toy-size red house for placement on the moon's dusty surface. Company officials said it was too soon to know whether the same problem doomed both missions. 'This is the second time that we were not able to land. So we really have to take it very seriously," Mr. Hakamada told reporters. He stressed that the company would press ahead with more lunar missions. A preliminary analysis indicates the laser system for measuring the altitude did not work as planned, and the lander descended too fast, officials said. "Based on these circumstances, it is currently assumed that the lander likely performed a hard landing on the lunar surface,' the company said in a written statement. Long the province of governments, the moon became a target of private outfits in 2019, with more flops than wins along the way. Launched in January from Florida on a long, roundabout journey, Resilience entered lunar orbit last month. It shared a SpaceX ride with Firefly Aerospace's Blue Ghost, which reached the moon faster and became the first private entity to successfully land there in March. Another U.S. company, Intuitive Machines, arrived at the moon a few days after Firefly. But the tall, spindly lander face-planted in a crater near the moon's south pole and was declared dead within hours. Resilience was targeting the top of the moon, a less treacherous place than the shadowy bottom. The ispace team chose a flat area with few boulders in Mare Frigoris or Sea of Cold, a long and narrow region full of craters and ancient lava flows that stretches across the near side's northern tier. Plans had called for the 7.5-foot (2.3-meter) Resilience to beam back pictures within hours and for the lander to lower the piggybacking rover onto the lunar surface this weekend. Made of carbon fiber-reinforced plastic with four wheels, ispace's European-built rover — named Tenacious — sported a high-definition camera to scout out the area and a shovel to scoop up some lunar dirt for NASA. The rover, weighing just 11 pounds (5 kilograms), was going to stick close to the lander, going in circles at a speed of less than one inch (a couple centimeters) per second. It was capable of venturing up to two-thirds of a mile (1 kilometer) from the lander and should be operational throughout the two-week mission, the period of daylight. Besides science and tech experiments, there was an artistic touch. The rover held a tiny, Swedish-style red cottage with white trim and a green door, dubbed the Moonhouse by creator Mikael Genberg, for placement on the lunar surface. Minutes before the attempted landing, Hakamada assured everyone that ispace had learned from its first failed mission. 'Engineers did everything they possibly could' to ensure success this time, he said. He considered the latest moonshot 'merely a steppingstone' to its bigger lander launching by 2027 with NASA involvement. Ispace, like other businesses, does not have 'infinite funds' and cannot afford repeated failures, Jeremy Fix, chief engineer for ispace's U.S. subsidiary, said at a conference last month. While not divulging the cost of the current mission, company officials said it's less than the first one which exceeded $100 million. Two other U.S. companies are aiming for moon landings by year's end: Jeff Bezos' Blue Origin and Astrobotic Technology. Astrobotic's first lunar lander missed the moon altogether in 2024 and came crashing back through Earth's atmosphere. For decades, governments competed to get to the moon. Only five countries have pulled off successful robotic lunar landings: Russia, the U.S., China, India and Japan. Of those, only the U.S. has landed people on the moon: 12 NASA astronauts from 1969 through 1972. NASA expects to send four astronauts around the moon next year. That would be followed a year or more later by the first lunar landing by a crew in more than a half-century, with SpaceX's Starship providing the lift from lunar orbit all the way down to the surface. China also has moon landing plans for its own astronauts by 2030.
India Today
26-05-2025
- Science
- India Today
Isro ground PSLV fleet after launch disaster, continues to prep for Nisar launch
Days after the Polar Satellite Launch Vehicle failed moments after launch, the Indian Space Research Organisation (Isro) has temporarily grounded its trusted PSLV development comes following the failure of the PSLV-C61 mission on May 18, which was carrying the advanced EOS-09 earth observation decision comes as a high-level committee investigates the anomaly that led to the rocket's third-stage malfunction, resulting in the loss of the satellite and rocket over the Indian The PSLV, renowned for its 94% success rate with only four failures in 64 missions, encountered a rare setback when the third stage of PSLV-C61 suffered a sudden drop in chamber pressure, causing a loss of the first two stages performing reliably, the third stage's solid-fuel motor did not generate sufficient thrust, and the mission was aborted less than seven minutes after suspect a rupture in the fibre casing of the third-stage motor as a possible cause, with hot gases from the burning fuel potentially entering sensitive EOS-09 satellite, equipped with a sophisticated Synthetic Aperture Radar (SAR) capable of all-weather, day-and-night imaging, was intended to support environmental monitoring, disaster response, and national security loss is a significant operational setback for Isro, but officials remain confident in a swift the PSLV grounding, Isro's other launch vehicles remain for the high-profile Nasa-Isro Synthetic Aperture Radar (Nisar) mission, scheduled for launch in June 2025 aboard a GSLV rocket, are proceeding as Nisar mission, a $1.5 billion collaboration with Nasa, will deploy one of the world's most advanced radar imaging satellites to monitor Earth's changing systems and natural and external expert committees are now scrutinising telemetry and system diagnostics from the failed PSLV mission, with a detailed report expected by officials stress that the temporary grounding of PSLV is a standard safety measure and will not impact the schedule of other critical missions, including Nisar and the upcoming Gaganyaan human spaceflight Isro investigates the rare PSLV failure, its focus remains on ensuring flawless operations for future launches, particularly with ambitious crewed and international missions on the Watch
New Indian Express
25-05-2025
- Science
- New Indian Express
Crewed missions ahead, Isro needs zero-flaw operations
The May 18 failure of India's workhorse Polar Satellite Launch Vehicle (PSLV) rocket to deliver sophisticated earth observation satellite EOS-09 to its intended orbit in space is a hard knock for the Indian Space Research Organisation (ISRO). The four-stage PSLV-C61 launcher lifted off with the EOS-09 satellite sharp at 5.59 am from Satish Dhawan Space Centre, Sriharikota. The first two stages performed reliably, but the problem began after the third stage fired. The PSLV-C61 lost thrust, and the remaining third and the fourth stage (latter nestling EOS-09) crashed into the sea. ISRO Chairman V Narayanan suspects it happened due to a fall in pressure in the PSLV-C61's third-stage motor chamber carrying Hydroxyl-terminated Polybutadiene as the solid propellant. Rocket propulsion experts understand that pressure in a rocket motor's combustion chamber can fall due to changes in the burning rate and surface area of the propellant or from issues within the nozzle, whether erosion or burning surface area. This caused a loss of thrust, preventing the PSLV-C61 from reaching the intended altitude of 534 km to release EOS-09 in its orbit and crashing about five minutes after launch.
NDTV
24-05-2025
- Science
- NDTV
ISRO Rocket Fails 7 Minutes Into Flight, National Panel Set Up To Find Out Why
New Delhi: ISRO could not accomplish the launch of a key Earth observation satellite on Sunday after the rocket carrying it, the workhorse PSLV-C61, failed mid-air, less than seven minutes after it took off. Determined to find the root cause of the failure, the space agency has set up a National Failure Analysis Committee and a complete audit of the rocket is underway, with all systems being reviewed thoroughly. The committee, more than half of whose members are from premier institutions like the Indian Institute of Science (IISc) and Indian Institutes of Technology (IITs), is expected to submit its report around the middle of next month. A set of voluminous data has already been shared with the panel. ISRO has also set up several internal committees to scrutinise every aspect of the Polar Satellite Launch Vehicle (PSLV), which is a highly dependable rocket, with a reliability of over 94% and just four failures in 63 launches - an enviable track record. Sources in the space agency said only the PSLV, and no other rocket, has been put on hold since its third stage uses a solid fuel motor, which is unique to it. The final call, they indicated, will be taken on future launches only after the National Failure Analysis Committee submits its report and ISRO fixes the problem. Giving an analogy, an expert said each rocket is like a child. "If one child falls down, can you ask the entire village to stop walking?" he quipped. A notice to airmen (or NOTAM), has, meanwhile, already been issued for the launch of the Geosynchronous Satellite Launch Vehicle Mark-2 or GSLV F-16 to fly between June 18 and July 17. The rocket, initially dubbed 'ISRO's naughty boy' and eventually tamed, is all set to fly the world's most expensive civilian Earth imaging satellite, named the NASA-ISRO Synthetic Aperture Radar Satellite or NISAR. It has been built by India and the US at a cost of $1.5 billion. Third-Stage Issue NDTV had earlier reported that a 'misbehaviour' of the third stage rocket motor may have contributed to the failure of the PSLV-C61, which was launching the EOS-9 surveillance satellite. The PSLV-C61 was travelling at 20,160 km per hour - about 28 times the speed of an airplane - when, some 888 km downrange from Sriharikota over the Indian Ocean, it tumbled down 6.26 minutes into its nearly 18-minute flight. Experts say the third stage did not explode, as speculated. In fact, as the rocket coasted along while losing altitude and thrust, even the fourth stage was probably ignited. It is still being analysed why the rocket motor "misbehaved" 100 seconds after it ignited the third stage. ISRO Chairman V Narayanan said there was a "fall in the chamber pressure of the motor case". Dr G Madhavan Nair, former Chairman of ISRO, a rocket specialist who played a key role as project director in mastering the PSLV rocket, estimates that a "possible rupture in the fibre casing of the nearly 8-tonne rocket motor could have been the cause of the failure". This remains the main suspect, but all angles are being investigated. The PSLV is a much-sought-after vehicle globally and India's launch site offers a unique location to maximally use its potential.
