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Subject: Space Technology

  • What is a Solar Storm?

    Studies have found that a powerful solar storm can cause a disruption of the internet, damage submarine cables, and communication satellites.

    What is a Solar Storm?

    • A solar storm or a Coronal Mass Ejection as astronomers call it is an ejection of highly magnetized particles from the sun.
    • These particles can travel several million km per hour and can take about 13 hours to five days to reach Earth.
    • Earth’s atmosphere protects us, humans, from these particles.
    • But the particles can interact with our Earth’s magnetic field, induce strong electric currents on the surface and affect man-made structures.

    History of solar storms

    • The first recorded solar storm occurred in 1859 and it reached Earth in about 17 hours.
    • It affected the telegraph network and many operators experienced electric shocks.
    • A solar storm that occurred in 1921 impacted New York telegraph and railroad systems and another small-scale storm collapsed the power grid in Quebec, Canada in 1989.
    • A 2013 report noted that if a solar storm similar to the 1859 one hit the US today, about 20-40 million people could be without power for 1-2 years, and the total economic cost will be $0.6-2.6 trillion.

    Why is it a cause of concern?

    • The Sun goes through an 11-year cycle – cycles of high and low activity.
    • It also has a longer 100-year cycle.
    • During the last three decades, when the internet infrastructure was booming, it was a low period.
    • And very soon, either in this cycle or the next cycle, we are going towards the peaks of the 100-year cycle.
    • So it is highly likely that we might see one powerful solar storm during our lifetime.

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  • Tasks accomplished by the Chandrayaan-2

    The failure of Chandrayaan-2, India’s second mission to the Moon, to make a soft landing on the lunar surface had led to much disappointment.  But that did not mean the entire mission had been wasted.

    Chandrayaan-2: A quick recap

    • Chandrayaan-2 consisted of an Orbiter, Lander and Rover, all equipped with scientific instruments to study the moon.
    • The Orbiter would watch the moon from a 100-km orbit, while the Lander and Rover modules were to be separated to make a soft landing on the moon’s surface.
    • ISRO had named the Lander module as Vikram, after Vikram Sarabhai, the pioneer of India’s space programme, and the Rover module as Pragyaan, meaning wisdom.

    Utility of the Orbit

    • The Orbiter part of the mission has been functioning normally. It is carrying eight instruments.
    • Each of these instruments has produced a handsome amount of data that sheds new light on the moon and offers insights that could be used in further exploration.

    Some of the most significant results so far:

    (a) Water

    • The presence of water on the Moon had already been confirmed by Chandrayaan-1, India’s first mission to the Moon that flew in 2008.
    • Using far more sensitive instruments, the Imaging Infra-Red Spectrometer (IIRS) onboard Chandrayaan-2 has been able to distinguish between hydroxyl and water molecules and found unique signatures of both.
    • This is the most precise information about the presence of H2O molecules on the Moon to date.
    • Previously, water was known to be present mainly in the polar regions of the Moon.
    • Chandrayaan-2 has now found signatures of water at all latitudes, although its abundance varies from place to place.

    (b) Minor elements

    • The Large Area Soft X-ray Spectrometer (CLASS) measures the Moon’s X-ray spectrum to examine the presence of major elements such as magnesium, aluminum, silicon, calcium, titanium, iron, etc.
    • This instrument has detected the minor elements chromium and manganese for the first time through remote sensing, thanks to a better detector.
    • The finding can lay the path for understanding magmatic evolution on the Moon and deeper insights into the nebular conditions as well as planetary differentiation.
    • CLASS has mapped nearly 95% of the lunar surface in X-rays for the first time.
    • Sodium, also a minor element on the Moon surface, was detected without any ambiguity for the first time.

    (c) Study of Sun

    • One of the payloads, called Solar X-ray Monitor (XSM), besides studying the Moon through the radiation coming in from the Sun, has collected information about solar flares.
    • XSM has observed a large number of microflares outside the active region for the first time.
    • This has great implications on the understanding of the mechanism behind the heating of the solar corona, which has been an open problem for many decades.

    Utility of this Data

    • While the Orbiter payloads build upon existing knowledge of the Moon in terms of its surface, sub-surface and exosphere, it also paves the path for future Moon missions.
    • Four aspects — mineralogical and volatile mapping of the lunar surface, surface and subsurface properties and processes involved, quantifying water in its various forms across the Moon surface, and maps of elements present on the moon — will be key for future scope of work.
    • A key outcome from Chandrayaan-2 has been the exploration of the permanently shadowed regions as well as craters and boulders underneath the regolith, the loose deposit comprising the top surface extending up to 3-4m in depth.
    • This is expected to help scientists to zero in on future landing and drilling sites, including for human missions.

    Who is going to use it?

    • Some key future Moon missions that hope to make use of such data include the Japan Aerospace Exploration Agency (JAXA)-ISRO collaboration Lunar Polar Exploration (LUPEX) mission scheduled for launch in 2023/2024.
    • Its aim is to obtain knowledge of lunar water resources and to explore the suitability of the lunar polar region for setting up a lunar base.
    • NASA’s Artemis missions plan to enable human landing on the Moon beginning 2024 and target sustainable lunar exploration by 2028.
    • The Chinese Lunar Exploration Programme too plans to establish a prototype of the International Lunar Research Station (ILRS) at the lunar south pole and build a platform supporting large-scale scientific exploration.

    What was missed because of the crash-landing?

    • The most obvious miss has been the opportunity to demonstrate the technology to make a soft landing in outer space.
    • The lander Vikram and rover Pragyaan were carrying instruments to carry out observations on the surface.
    • These were supposed to pick up additional information about the terrain, and composition, and mineralogy.
    • While the instruments onboard the Orbiter is making “global” observations, those on the lander and rover would have provided much more local information.
    • The two diverse sets of data could have helped prepare a more composite picture of the Moon.

    Future with the Chandrayaan-3

    • ISRO scientists maintain that the accident was caused by a relatively small error that has been identified and corrected.
    • But, to demonstrate this technology all over again, ISRO would have to send a fresh mission, Chandrayaan-3, planned for next year.
    • It is expected to have only a lander and rover, and no Orbiter.

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  • Inspiration4: SpaceX’s first all-civilian space mission

    SpaceX has announced its ‘Inspiration4’ mission, the first all-civilian, non-governmental spaceflight, for launch.

    What is Inspiration4?

    • Inspiraton4 is a part of an effort to raise funds for pediatric treatment and research facility that focuses on children’s catastrophic diseases, particularly leukemia and other cancers.
    • The mission involves circling the Earth for three days and then splashing down into the Atlantic Ocean.
    • Inspiration4 will orbit the Earth at 575km, higher than the International Space Station (408km) and the Hubble space telescope (547km).
    • This will be the farthest distance travelled by a crewed mission since 2009, when astronauts last went to repair the Hubble.
    • The Dragon module that the group will be using has also been modified for the mission.
    • Usually, the SpaceX module is used for travelling to the ISS, where it has to dock or join the floating laboratory.

    UPSC may ask an MCQ asking: Which of the following is/are the space missions related to human flights? It may throw up 4-5 options (which we all get confused at after few months) like Cassini , InSight , Messanger, Voyager etc.

    Key feature: Dome window

    • Since Inspiration4 is not going to the ISS, the docking port has been removed and has been replaced with a dome window instead.
    • This dome window will offer breath-taking views of the Earth for the four travellers.
    • The window has been inspired by the Cupola, a module on the ISS used to make observations about our planet.

    Why is the mission significant?

    • According to a report in the Independent, the journey will present an opportunity for collecting large amounts of health data that will aid in planning future crewed space missions.
    • As per the report, they will collect data on ECG (electrocardiograph) activity, movement, sleep, heart rate, and rhythm, blood oxygen saturation, cabin noise and light intensity, which will help in assessing behavioral and cognitive changes over the journey.
    • The travelers will undergo balance and prescription tests just before and after their journey to assess their response to the change in gravity.
    • The immune system function will also be monitored by collecting blood. Their organ systems will also be monitored by an AI-powered ultrasound device.

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  • [pib] Formation of Blue Straggler

    Carrying out the first-ever comprehensive analysis of blue stragglers, Indian researchers found that half of the blue stragglers in their sample are formed through mass transfer from a close binary companion star.

    What are Blue Stragglers?

    • A blue straggler is a main-sequence star in an open or globular cluster that is more luminous and bluer than stars at the main sequence turnoff point for the cluster.
    • The most likely explanation is that blue stragglers are the result of stars that come too close to another star or similar mass object and collide.
    • The newly-formed star has thus a higher mass and occupies a position on the HR diagram which would be populated by genuinely young stars.
    • One-third of them are likely formed through collisions of 2 stars, and the remaining are formed through interactions of more than 2 stars.

    How are they formed?

    • A bunch of stars born at the same time from the same cloud form a star cluster.
    • As time passes, each star evolves differently depending on its mass.
    • The most massive and bright stars evolve and move off the main sequence creating a bend in their track, known as the turnoff.
    • Stars above this bend or brighter and hotter stars are not expected in a cluster, as they leave the main sequence to become red giants.
    • But in 1953, Allan Sandage found that some stars seem to be hotter than the turnoff of the parent cluster.

    Behind the nomenclature

    • Initially, these blue stars still straggling above the turnoff were not part of these clusters.
    • However, later studies confirmed that these stars are indeed cluster members, and they were termed “Blue Stragglers”.
    • The only probable way these stars can still be present in these clusters is if they have somehow acquired extra mass along the way while on the main sequence.
    • Confirming the mechanisms of the mass gain required a study using a large sample of blue-straggler stars and estimates of the mass they have gained.

    What have Indian researchers found?

    • Research showed that these stars are primarily present in the older and massive star clusters. And due to their large mass, they are segregated towards the centre of the clusters.
    • The researchers compared the mass of the blue stragglers to the mass of the turnoff stars (which are the most massive ‘normal’ stars in the cluster) and predicted the formation mechanisms.
    • The study will help improve understanding of these stellar systems to uncover exciting results in studies of large stellar populations, including galaxies.
    • Following these findings, the researchers are conducting detailed analyses of individual blue stragglers in the catalog to obtain their stellar properties.

  • [pib] Merging of three Supermassive Black Holes

    Indian researchers have discovered three supermassive black holes from three galaxies merging together to form a triple active galactic nucleus, a compact region at the centre of a newly discovered galaxy that has a much-higher-than-normal luminosity.

    What are Supermassive black holes?

    • A supermassive black hole is the largest type of black hole, with mass on the order of millions to billions of times the mass of the Sun.
    • Black holes are a class of astronomical objects that have undergone gravitational collapse, leaving behind spheroidal regions of space from which nothing can escape, not even light.
    • They are difficult to detect because they do not emit any light. But they can reveal their presence by interacting with their surroundings.

    Active galactic nuclei (AGN) from such black holes

    • When the dust and gas from the surroundings fall onto a supermassive black hole, some of the mass is swallowed by the black hole, but some of it is converted into energy.
    • This is emitted back as electromagnetic radiation that makes the black hole appear very luminous.
    • They are called active galactic nuclei (AGN) and release huge amounts of ionized particles and energy into the galaxy and its environment.
    • Both of these ultimately contribute to the growth of the medium around the galaxy and ultimately the evolution of the galaxy itself.

    How does merger of black holes occur?

    • A major factor impacting galaxy evolution is galaxy interactions, which happen when galaxies move close by each other and exert tremendous gravitational forces on each other.
    • During such galaxy interactions, the respective supermassive black holes can get near each other.
    • The dual black holes start consuming gas from their surroundings and become dual AGN.

    What happens when galaxies collide?

    • If two galaxies collide, their black hole will also come closer by transferring the kinetic energy to the surrounding gas.
    • The distance between the blackholes decreases with time until the separation is around a parsec (3.26 light-years).
    • The two black holes are then unable to lose any further kinetic energy in order to get even closer and merge.
    • This is known as the final parsec problem.

    Here comes the third black hole

    • Many AGN pairs have been detected in the past, but triple AGN are extremely rare, and only a handful has been detected before using X-ray observations.
    • The presence of a third black hole can solve this problem.
    • The dual merging blackholes can transfer their energy to the third blackhole and merge with each other.

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  • CHAPEA Mission by NASA

    NASA is seeking applications for its new mission called the Crew Health and Performance Exploration Analog (CHAPEA), which is related to Mars.

    CHAPEA

    • The mission is set to begin in 2022 and will give four successful applicants the chance to live and work in a 1,700 square-foot module that is created by a 3D printer and is called the Mars Dune Alpha.
    • The simulated quarters include a kitchen, areas for medical, recreation, fitness, work, crop growth, a technical work area and two bathrooms.
    • This habitat will simulate what it feels like to carry out missions on Mars including resource limitations, equipment failure, communication delays and any other environmental stressors.
    • The crew will be expected to perform simulated spacewalks, scientific research and use virtual reality and robotic controls and exchange communications.

    What is the purpose of this mission?

    • The habitat in which the crew members will stay will be as Mars-realistic as possible.
    • The results from this analog mission will provide scientific data that will help in validating the systems that will be used for actual missions to Mars and also help in solving problems for spaceflight research.
    • CHAPEA is not the only analog mission, there are others including Aquarius/NEEMO, Concordia, Desert RATS, and HESTIA.
    • Analog missions are required because not all experiments can be carried out in space because resources and money are limited.

  • NASA-ISRO Synthetic Aperture Radar

    The NASA-ISRO Synthetic Aperture Radar satellite, aimed at making global measurement of land surface changes using advanced radar imaging, is proposed to be launched in early 2023, informed Earth Sciences Minister.

    Note the key features of the Mission. Every statement has a unique information.

    NASA-ISRO SAR

    • NISAR is a joint collaboration for a dual-frequency L and S-band SAR for earth observation.
    • NASA and Bengaluru-headquartered ISRO signed a partnership on September 30, 2014, to collaborate on and launch NISAR.
    • The mission is targeted to launch in early 2022 from ISRO’s Sriharikota spaceport in Andhra Pradesh’s Nellore district, about 100km north of Chennai.
    • It is capable of producing extremely high-resolution images for a joint earth observation satellite mission with NASA.
    • It will be the first satellite mission to use two different radar frequencies (L-band and S-band) to measure changes in our planet’s surface less than a centimeter across.

    Objectives of the NISAR

    • NISAR will observe Earth’s land and ice-covered surfaces globally with 12-day regularity on ascending and descending passes, sampling Earth on average every six days for a baseline three-year mission.
    • It will measure Earth’s changing ecosystems, dynamic surfaces, and ice masses, providing information about biomass, natural hazards, sea-level rise, and groundwater, and will support a host of other applications.
    • It would also provide data on natural hazards including earthquakes, tsunamis, volcanoes, and landslides.

    What are L and S Bands?

    • L band waves are used for GPS units because they are able to penetrate clouds, fog, rain, storms, and vegetation.
    • The S-band is used by airport surveillance radar for air traffic control, weather radar, surface ship radar, and some communications satellites, especially those used by NASA to communicate with the Space Shuttle and the International Space Station.
    • NISAR uses a sophisticated information-processing technique known as SAR to produce extremely high-resolution images.
    • Radar penetrates clouds and darkness, enabling NISAR to collect data day and night in any weather.

    What is collaboration?

    • NASA is providing the mission’s L-band SAR, a high-rate communication subsystem for science data, GPS receivers, a solid-state recorder, and payload data subsystem.
    • ISRO is providing the spacecraft bus, the S-band radar, the launch vehicle, and associated launch services for the mission, whose goal is to make global measurements of the causes and consequences of land surface changes using advanced radar imaging.

  • Stellar Mid-life Crisis: What ails the middle-aged Sun?

    Stars like our Sun can go through a mid-life crisis, according to new research carried out by scientists from IISER Kolkata.

    Stellar Middle Age

    • At about 4.6 billion years of age, the sun is middle-aged, that is, it will continue to live for roughly the same period.
    • There are accurate methods for estimating the age of the Sun, such as by using radioactive dating of very old meteorites that have fallen on the Earth.
    • However, for more distant stars which are similar in mass and age to the Sun, such methods are not possible.
    • One of the methods used is called gyrochronology.
    • There is a relationship between rotation rate and age, that is the rotation rate of a star slows down with age.

    How does it occur?

    • When the stellar wind escapes from the star, it carries away with it a part of the angular momentum of the star, which results in its slowing down.
    • The stellar wind has two drivers: one is the high temperature of the outer atmosphere of stars – the corona – which results in an outward expansion and hence plasma winds that emanate out.
    • The other is the magnetic field.
    • The magnetic field actually heats the corona and so when magnetic activity is strong the winds are strong and since wind carries away the internal (rotational) angular momentum of the star, it slows down its rotation.
    • This is called magnetic braking.
    • As the star ages, due to this mechanism, its rotation slows down and this relationship is used in gyrochronology to estimate the age of the star.

    Impact

    • This can lead to dramatic changes in their activity and rotation rates.
    • The study also provides an explanation for the breakdown of the long-established relation between rotation rate and age in middle-aged sunlike stars.
    • However, there is a breakdown of the gyrochronology relationship, because, after midlife, a star’s rate of spin does not slow down with age as fast as it was slowing down earlier.
    • Another intriguing fact is that the Sun’s activity level has been observed to be much lower than other stars of similar age.

  • Geo-imaging satellite EOS-03

    Geo-imaging satellite for earth observation EOS-03, which would enable near real-time monitoring of natural disasters like floods and cyclones, is scheduled for launch in the third quarter of 2021.

    EOS-03

    • ISRO has realized a geo-imaging satellite, “EOS-03”, for Earth Observation from Geostationary Orbit.
    • EOS-03 is capable of imaging the whole country four-five times daily and would enable near real-time monitoring of natural disasters like floods and cyclones.
    • In addition to natural disasters, EOS-03 would also enable monitoring of water bodies, crops, vegetation condition, forest cover changes.

    Other developments: Small Satellite Launch Vehicle (SSLV)

    • The first developmental flight of the Small Satellite Launch Vehicle (SSLV) is scheduled for the fourth quarter of 2021 from the Satish Dhawan Space Centre, Sriharikota.
    • The SSLV is a cost-effective, three-stage and all-solid launch vehicle with a payload capability of 500 kg to 500 km planar orbit or 300 kg to Sun-Synchronous Polar Orbit.
    • It is ideal for the on-demand, quick turn-around launch of small satellites.
    • The major technologies developed as part of SSLV are flexible nozzle control with electro-mechanical actuators for all stages, miniaturized avionics, and a velocity trimming module in the upper stage for precise satellite injection.

  • Russia’s Nauka Module for ISS

    Pirs, a Russian module on the International Space Station (ISS) used as a docking port for spacecraft and as a door for cosmonauts to go out on spacewalks. In its place, Russia’s space agency Roscosmos will be attaching a significantly larger module called Nauka.

    What does Russia’s new Nauka module do?

    • Nauka, which is 42 feet long and weighs 20 tonnes, was supposed to be launched as early as 2007, as per the ISS’s original plan.
    • Nauka — meaning “science” in Russian — is the biggest space laboratory Russia has launched to date, and will primarily serve as a research facility.
    • It is also bringing to the ISS another oxygen generator, a spare bed, another toilet, and a robotic cargo crane built by the European Space Agency (ESA).
    • The new module was sent into orbit using a Proton rocket — the most powerful in Russia’s space inventory — on July 21 and will take eight days to reach the ISS.

    What kind of research goes on at the International Space Station?

    • A space station is essentially a large spacecraft that remains in low-earth orbit for extended periods of time.
    • It is like a large laboratory in space and allows astronauts to come aboard and stay for weeks or months to carry out experiments in microgravity.
    • For over 20 years since its launch, humans have continuously lived and carried out scientific investigations on the $150 billion ISS under microgravity conditions, being able to make breakthroughs in research not possible on Earth.

    Back2Basics: International Space Station (ISS)

    • The International Space Station, which launched its first piece in 1998, is a large spacecraft that orbits around the Earth and is home to the astronauts.
    • The ISS is currently the only active space station in the earth’s orbit.
    • The first crew on the space station arrived on November 2, 2000.
    • The space station is home to a minimum of six astronauts, with two bathrooms, a gymnasium, and a big bay window.
    • It is a joint project between five participating space agencies -NASA (USA), Roscosmos (Russia), JAXA (Japan), ESA (Europe), and CSA (Canada).