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Subject: Space Technology

  • Starman Suits in Demo-2 Mission

    NASA’s SpaceX Demo-2 test flight has now been rescheduled for May 31, due to weather conditions. Apart from the test flight itself, what’s getting attention are the spacesuits that the astronauts will wear while travelling in the SpaceX capsule, called Crew Dragon.

    Try this question from CSP 2014:

    Q. Which of the following pair is/are correctly matched?

    Spacecraft Purpose
    1. Cassini-Huygens Orbiting the Venus and transmitting data to the Earth
    2. Messenger Mapping and investigating the Mercury
    3. Voyager 1 and 2 Exploring the outer solar system

    Select the correct answer using the code given below.

    a) 1 only

    b) 2 and 3 only

    c) 1 and 3 only

    d) 1, 2 and 3

    The SpaceX spacesuit

    • The so-called “Starman suits” the astronauts will wear on the Demo-2 mission have been designed by a famous Hollywood costume designer.
    • The SpaceX spacesuits are different from other spacesuits typically worn by astronauts because of their sleek design and are being described as resembling a tuxedo.
    • These spacesuits are meant to be lighter and more flexible, are equipped with touchscreen gloves, have vents that allow astronauts to be cooler while maintaining pressure inside the suit, and have an incorporated helmet and visor.
    • The helmets of these suits are 3D printed with touchscreen-sensitive gloves and the suit is all in one piece, customised for the wearer.

    How are launch-and-entry spacesuits different from EMUs?

    • The SpaceX suits are only meant to be worn inside the space shuttle and are not suitable for carrying out spacewalks.
    • Spacesuits for spacewalks, called Extravehicular Mobility Units (EMUs), are heavier than launch-entry suits (LES) and are already present aboard the ISS.
    • While inside the spacecraft, the atmosphere can be controlled, to explore and work in space, humans require that they take their environment with them because there are atmospheric pressure and no oxygen to sustain life.
    • Such spacesuits – EMUs — are worn for spacewalks or extravehicular activities (EVA) conducted outside a space shuttle.
    • These provide astronauts with oxygen supply and protect them against extreme temperatures, radiation and space dust.

    Back2Basics

    Demo-2 Mission by SpaceX

  • China’s Mars Mission: Tianwen-1

    China’s space program is now slated to achieve a new milestone. In July, the country will launch its first Mars mission, the ‘Tianwen-1’, which is expected to land on the Red Planet’s surface in the first quarter of 2021.

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

    Tianwen-1 Mission

    • The mission is named after the ancient Chinese poem ‘Questions to Heaven’, the Tianwen-1.
    • It is an all-in-one orbiter; lander and rover will search the Martian surface for water, ice, investigate soil characteristics, and study the atmosphere, among completing other objectives.
    • It will carry 13 payloads (seven orbiters and six rovers) that will explore the planet.
    • It will be the first to place ground-penetrating radar on the Martian surface, which will be able to study local geology, as well as rock, ice, and dirt distribution.
    • China’s previous ‘Yinghuo-1’ Mars mission, which had piggybacked on a Russian spacecraft, had failed after it could not leave the Earth’s orbit and disintegrated over the Pacific Ocean in 2012.

    Why all are curious about Mars exploration?

    • After the Moon, the most number of space missions in the Solar System has been to Mars.
    • Despite being starkly different in many ways, the Red Planet has several Earth-like features– such as clouds, polar ice caps, canyons, volcanoes, and seasonal weather patterns.
    • For ages, scientists have wondered whether Mars can support life.
    • In the past few years, Mars missions have been able to discover the possible presence of liquid water on the planet, either in the subsurface today or at some point in its past.
    • This has made space explorers more curious about whether the planet can sustain life.
    • Newer NASA missions have since transitioned from their earlier strategy of “Follow the Water” to “Seek Signs of Life”.

    Back2Basics: Various missions on Mars

    • The USSR in 1971 became the first country to carry out a Mars landing– its ‘Mars 3’ lander being able to transmit data for 20 seconds from the Martian surface before failing.
    • The country made it’s second and Mars landing two years later in 1973.
    • The second country to reach Mars’s surface, the US, holds the record for the most number of Mars landings.
    • Since 1976, it has achieved 8 successful Mars landings, the latest being the ‘InSight’ in 2019 (launched in 2018).
    • India and the European Space Agency have been able to place their spacecraft in Mars’s orbit.
    • India’s Mars Orbiter Mission (MOM) or ‘Mangalyaan’ was able to do so in September 2014, almost a year after its launch from the Satish Dhawan Space Centre in Andhra Pradesh.
    • The Chinese mission now is expected to take off around the same time when NASA is launching its own Mars mission– the ambitious ‘Perseverance’ which aims to collect Martian samples and bring them back.

  • What is a Parallel Universe?

    Twitter and other social media platforms are abuzz with the so-called ‘parallel universe’ that NASA has discovered. According to the claims, NASA has detected a parallel universe in Antarctica, where time runs backwards.

     

    ANITA experiment is significant for prelims. It can be asked in prelims in such match the pair questions-

    Q. Consider the following pairs :

    Terms sometimes seen in news                                Context / Topic

    1. Belle 2 experiment –                                        Artificial Intelligence

    2. Blockchain technology –                               Digital Cryptocurrency

    3. CRISPR – Cas9 –                                               Particle Physics

    Which of the pairs given above is/are correctly matched? (CSP 2018)

    (a) 1 and 3 only

    (b) 2 only

    (c) 2 and 3 only

    (d) 1, 2 and 3

    What is a Parallel Universe?

    • In quantum mechanics, a parallel universe is theorized as existing alongside our own, although undetectable.
    • The recent reports claiming that there is evidence of a parallel universe appear to be based on ANITA findings that are at least a couple of years old.
    • A science magazine had published a feature, discussing some anomalous results coming from neutrino detection experiments in Antarctica.
    • It discussed a speculative cosmological model that posits there’s an antimatter universe extending backwards from the BigBang.
    • This theorem was also proposed by famous scientist Stephens Hawking.

    What were the anomalous detections in Antarctica?

    The ANITA experiment

    • Four years ago an experiment had spotted a handful of instances of what seemed to be highly energetic neutrinos coming through the Earth.
    • It was named Antarctic Impulsive Transient Antenna (ANITA) experiment — a high-altitude helium balloon with an array of radio antennas, partially funded by NASA.
    • The telescope could spot these neutrinos coming from the space and hitting the ice sheet in Antarctica.
    • ANITA detected these particles, but instead of coming from the space, the neutrinos were found to be coming from the Earth’s surface without any source.
    • These detections happened in 2016, then again in 2018, but there was no credible explanation.
    • Physicists have been working to figure out if these results can be explained with our current models of physics or have something to do with the experimental set-up itself, or if something like the parallel universe does exist.

    Back2Basics: Neutrinos

    • A neutrino is a subatomic particle very similar to an electron.
    • But it has no electrical charge and a very small mass, which might even be zero.
    • Neutrinos are one of the most abundant particles in the universe.
    • Because they have very little interaction with matter, they are incredibly difficult to detect.

  • Demo-2 Mission by SpaceX

    NASA’s SpaceX Demo-2 test flight will lift off for International Space Station (ISS) becoming the first crewed flight to launch from American soil since the conclusion of the space shuttle era in 2011.

    We can get a match the pair type question in prelims asking various space missions and their purposes. Make note of similar space missions from here.

    Try this:

    Q. Which of the following pair is/are correctly matched? (CSP 2014)

    Spacecraft Purpose
    1. Cassini-Huygens Orbiting the Venus and transmitting data to the Earth
    2. Messenger Mapping and investigating the Mercury
    3. Voyager 1 and 2 Exploring the outer solar system

    Select the correct answer using the code given below.

    a) 1 only

    b) 2 and 3 only

    c) 1 and 3 only

    d) 1, 2 and 3

    Demo-2: What is the mission?

    • The Demo-2 mission is part of NASA’s Commercial Crew Program with the aim of developing reliable and cost-effective access to and from the ISS.
    • Essentially, the lift-off is a flight test to certify if SpaceX’s crew transportation system can be used to ferry crew to and from the space station regularly.
    • After its launch, the Crew Dragon will perform a series of phasing manoeuvres to gradually approach and autonomously dock with the ISS.
    • After docking, the two astronauts will go aboard the ISS. They will perform tests of the Crew Dragon and conduct research with Expedition 63, the space station crew currently in residence at ISS.

    About the Commercial Crew Program

    • The main objective of this program is to make access to space easier in terms of its cost, so that cargo and crew can be easily transported to and from the ISS, enabling greater scientific research.
    • Secondly, by encouraging private companies such as Boeing and SpaceX to provide crew transportation NASA wants to focus on building spacecraft and rockets meant for deep space exploration missions.
    • Boeing and SpaceX were selected by NASA in September 2014 to develop transportation systems meant to transfer crew from the US to the ISS.

    Back2Basics: SpaceX

    • Space Exploration Technologies Corp., trading as SpaceX, is a private American aerospace manufacturer and space transportation Services Company headquartered in Hawthorne, California.
    • It was founded in 2002 by Elon Musk with the goal of reducing space transportation costs to enable the colonization of Mars.
    • SpaceX has developed several launch vehicles and the Dragon spacecraft.

  • What is Solar Minimum?

    The sun is said to have gone into a state called the ‘solar minimum’ and is about to enter the deepest period of ‘sunshine recession’ as sunspots are virtually not visibly at all.

    Practice question for Mains:

    Q. What are Solar minima and maxima? Discuss its impact on space weather and the Earth.

    What is a solar minimum and why is it happening now?

    • Sun has a cycle that lasts on average 11 years, and right now we are at the peak of that cycle.
    • Every 11 years or so, sunspots fade away, bringing a period of relative calm.
    • This is called the solar minimum. And it’s a regular part of the sunspot cycle.
    • While intense activity such as sunspots and solar flares subside during solar minimum, that doesn’t mean the sun becomes dull. Solar activity simply changes form.

    What about Solar Maximum?

    • Solar minima and maxima are the two extremes of the Sun’s 11-year and 400-year activity cycle.
    • At a maximum, the Sun is peppered with sunspots, solar flares erupt, and the Sun hurls billion-ton clouds of electrified gas into space.
    • Sky watchers may see more auroras, and space agencies must monitor radiation storms for astronaut protection.
    • Power outages, satellite malfunctions, communication disruptions, and GPS receiver malfunctions are just a few of the things that can happen during a solar maximum.

    What are its effects on Earth?

    a) On space weather

    • The Solar wind from coronal holes will temporarily create disturbances in the Earth’s magnetosphere, called geomagnetic storms, auroras, and disruptions to communications and navigation systems.
    • The space weather during solar minimum will also affect Earth’s upper atmosphere on satellites in low Earth orbit changes.
    • This means that the Earth’s upper atmosphere will cool down which is generally heated and puffed up by ultraviolet radiation from the sun.
    • However, the heat at the upper atmosphere of our planet helps Earth to drag debris and keep the low Earth orbit clear of manmade space junk.
    • Apart from this, the solar minimum will change the space weather significantly which will lead to an increase in the number of galactic cosmic rays that reach Earth’s upper atmosphere.
    • These Galactic cosmic rays are high energy particles which are a result of distant supernova explosions and other violent events in the galaxy.

    b) On astronauts

    • According to NASA the sun’s magnetic field weakens and provides less shielding from these cosmic rays during a solar minimum which will directly increase the threat to astronauts travelling through space.
    • This may cause health risks to astronauts travelling through space as the sun’s magnetic field weakens and provides less shielding from these cosmic rays.

  • Luhman 16A: A binary brown-dwarf system

    A group of international astrophysicists have identified cloud bands on the surface of Luhman 16A, one of a pair of binary brown dwarfs in the Vela constellation.

    Space terminology has gained importance in prelims. The Luhman 16A coupled with few more examples of space concepts like binary star and dwarf star are discussed in this newscard.

    Luhman 16A

    • Luhman 16 is a binary star system, the third closest system to the Sun after Alpha Centauri and Barnard’s star.
    • At a distance of about 6.5 light-years from the Sun, this pair of brown dwarfs referred to as Luhman 16A and Luhman 16B orbit each other, casting a dim light.
    • Brown dwarfs are also called failed stars because their masses are intermediate to the largest planets and the smallest main sequence stars.
    • Their masses being too small, they are unable to sustain fusion of their hydrogen to produce energy.
    • It is believed that some of the more massive brown dwarfs fuse deuterium or lithium and glow faintly.

    The cloud band over Luhman

    • The group, by using the Very Large Telescope at European Southern Observatory, Chile, found that Luhman 16A had band-like clouds in its atmosphere, whereas the same was not true of Luhman 16B.
    • Many astronomers detected polarization of brown dwarfs.
    • But what is special in the newest study of Luhman 16 is that the researchers have found the actual structure of the clouds — that they form bands over one of the pair.
    • Understanding the cloud system over a brown dwarf can shed light on the pressure, temperature and climate on the surface of the celestial body.

    Why it has made into a headline?

    • The researchers have used an idea put forth nearly two decades ago by Indian astrophysicist Sujan Sengupta, who works at the Indian Institute of Astrophysics, Bengaluru.
    • Sengupta had propounded the light emitted by a cloudy brown dwarf, or reflected off an extrasolar planet, will be polarized.
    • He then suggested that a polarimetric technique could serve as a potential tool to probe the environment of these objects.

    Back2Basics: Binary Star System

    • A binary star is a star system consisting of two stars orbiting around their common barycenter.
    • Systems of two or more stars are called multiple star systems.
    • These systems, especially when more distant, often appear to the unaided eye as a single point of light, and are then revealed as multiple by other means.
    • Binary star systems are very important in astrophysics because calculations of their orbits allow the masses of their component stars to be directly determined.

  • ‘The Long March 5B’ rocket

    China has successfully launched a new rocket and prototype spacecraft in a major test of the country’s ambitions to operate a permanent space station and send astronauts to the Moon.

    Can you recall the historical link between the name “The Long March” and China’s History.

    The Long March 5B

    • Long March 5 or Chang Zheng 5 is a Chinese heavy-lift launch system developed by the China Academy of Launch Vehicle Technology (CALT).
    • It is the first Chinese launch vehicle designed from the ground up to focus on non-hypergolic liquid rocket propellants.
    • The maximum payload capacities of the base variant are ~25,000 kilograms to Low Earth Orbit and ~14,000 kilograms to Geosynchronous Transfer Orbit.
    • The spaceship is expected to transport astronauts to a space station that China plans to complete by 2022 — and eventually to the Moon. It will have a capacity for a crew of six.

    Back2Basics: Geosynchronous Transfer Orbit

     

    • About 35,786 kilometers above the Earth’s surface, satellites are in geostationary orbit. From the center of the Earth, this is approximately 42,164 kilometers. This distance puts it in the high Earth orbit category.
    • At any inclination, a geosynchronous orbit synchronizes with the rotation of the Earth.
    • While geosynchronous satellites can have any inclination, the key difference to geostationary orbit is the fact that they lie on the same plane as the equator.
    • GTO is a an elliptical orbit used to transfer between two circular orbits of different radiuses in the same plane—used to reach geosynchronous or  geostationary orbit using high-thrust chemical engines.

  • [pib] Earth’s Magnetosphere and its dynamics

    Scientists at the Indian Institute of Geomagnetism (IIG) have developed a generalized one-dimensional fluid simulation code capable of studying a wide spectrum of coherent electric field structures of earth’s magnetosphere which can be useful in the planning of future space missions.

    The newscard talks of not so new phenomenon but a basic terminology of space sciences. Kindly make a note of what the Magnotesphere is, how it is formed, role of solar winds, Geodynamo etc.

    Earth’s Magnetosphere

    • The magnetosphere is the region of space surrounding Earth where the dominant magnetic field is the magnetic field of Earth, rather than the magnetic field of interplanetary space.
    • It is generated by the interaction of the solar wind with Earth’s magnetic field.

    Features of the Earth’s magnetosphere

    1) Bow shock,

    2) Magnetosheath,

    3) Magnetopause,

    4) Northern tail lobe,

    5) Southern tail lobe,

    6) Plasmasphere,

    7) Solar wind.

    How is it formed?

    • Sun is the major source of plasma deposition in space around the Earth. Sun forces some of its plasma towards the earth in the form of the solar wind.
    • The speed of this wind varies between 300 to 1500 km/s, which carries with it solar magnetic field, called as Interplanetary Magnetic Field (IMF).
    • The magnetic field is generated by electric currents due to the motion of convection currents of a mixture of molten iron and nickel in the Earth’s outer core.
    • These convection currents are caused by heat escaping from the core, a natural process called a geodynamo.

    Why study the magnetosphere?

    • The Earth’s magnetosphere is a vast region which has a finite number of satellites hurtling through this realm.
    • The morphology of the plasma processes around the satellite can be understood quite well.
    • However, when they leave the observational domain of one satellite to enter into another, a vast blind arena is created.
    • How the morphology of these processes changes over space and time can be ideally deciphered only through computer simulations.

    Outcome of the study

    • Almost 99% of matter in the universe is in the form of plasma, Earth’s magnetosphere, too, contains this material and the plasma.
    • They have the ability to hamper the working of a number of satellites that have been placed in orbit in the magnetospheric region.

    Significance

    • Apart from the well being of these expensive satellites, the academic understanding of this region is quite essential to comprehend the cosmos in its entirety.
    • The study will help advance the knowledge of plasma waves, instabilities, and coherent effects associated with wave-particle interactions that are useful in planning of future space missions.
    • It can also lead to precisely controlled fusion laboratory experiments for ever-expanding energy needs of humanity.

  • GW190412: The first merger of two black holes with unequal masses

    For the first time since it started functioning, the gravitational wave observatories at LIGO scientific collaboration have detected a merger of two unequal-mass black holes.

    This newscard contains few basic terms that one must know-

    Gravitational waves

    General Relativity

    Black Holes

    GW190412

    • The event, dubbed GW190412, was detected nearly a year ago, and this is almost five years after the first-ever detection of gravitational-wave signals by these powerful detectors.
    • Subsequent analysis of the signal coming from the violent merger showed that it involved two black holes of unequal masses coalescing.
    • One of them was some 30 times the mass of the Sun and the other which had a mass nearly 8 times the solar mass.
    • The actual merger took place at a distance of 2.5 billion light-years away.

    Significant feature observed

    • The detected signal’s waveform has special extra features in it when it corresponds to the merger of two unequal-sized black holes as compared with a merger of equal-sized black holes.
    • These features make it possible to infer many more things about the characters such as- a more accurate determination of the distance from the event, the spin or angular momentum of the more massive black hole and the orientation of the whole event with respect to viewers on Earth.
    • While the mass of the black hole bends the space-time close to it, the spin or angular momentum of this inscrutable object drags the nearby space-time, causing it to swirl around, along with it.
    • Hence both these properties are important to estimate.

    Confirmed General Relativity

    • An Indian team consisting of researchers verified the consistency of the signal with the prediction of General Relativity.
    • The existence of higher harmonics was itself a prediction of General Relativity.

    Must refer for an easy and illustrated understanding of General Relativity-

     

  • Unified Geologic Map of the Moon

    The first-ever digital, unified, global, geological map of the moon was released virtually by the  United States Geological Survey (USGS), NASA and the Lunar Planetary Institute.

    Unified Geologic Map of the Moon

    • The UGM will serve as a blueprint for future human missions and a source of research and analysis for the educators and the general public interested in lunar geology.
    • The map is a ‘seamless, globally consistent, 1:5,000,000-scale geologic map’.
    • The mapped surface features of the moon included crater rim crests, buried crater rim crests, fissures, grabens, scarps, mare wrinkle ridges, faults, troughs, rilles, and lineaments.

    How it was prepared?

    • The researchers built on the original digital renovation of the six maps comprising of the near, central far, east, west, north and south sides that was released in 2013.
    • The final map consists of 43 geologic units across the entire lunar surface, broken down into groups based on characteristics like materials of craters, basins, terra, plains and volcanic units.
    • Data from NASA’s Apollo Missions were used to come up with the map.

    Its’ significance

    • The moon’s South Pole is especially interesting because the area is much larger than the North Pole and there could be a possibility of the presence of water in these permanently shadowed areas.
    • Further, the South Pole region also contains the fossil record of the early Solar System.
    • These present and future moon missions’ success can be further helped by the digital map of the moon.
    • The Chandrayaan 2, an active mission also targets the Lunar South Pole for exploration.