💥Join UPSC 2027,2028 Mentorship (August Batch) + XFactor Notes & Microthemes PDF
Talk to Mentor

Civilsdaily

Login

Subject: Space Technology

  • Moon-forming region seen around an exoplanet for the first time

     

    Scientists for the first time have spotted a Moon-forming region around an exo-planet beyond our solar system.

    What are Exoplanets?

    • More than 4,400 planets have been discovered outside our solar system, called exoplanets.
    • Most orbit other stars, but free-floating exoplanets, called rogue planets, orbit the galactic center and are untethered to any star.
    • No circumplanetary discs had been found until now because all the known exoplanets resided in “mature” – fully developed – solar systems, except the two infant gas planets orbiting PDS 70.

    What is the new finding?

    • The researchers have detected a disc of swirling material accumulating around one of two newborn planets.
    • They were seen orbiting a young star called PDS 70, located a relatively close 370 light-years from Earth.
    • It is called a circumplanetary disc, and it is from these those moons are born.
    • The discovery offers a deeper understanding of the formation of planets and moons.

    Focus of the finding: Formation of disc

    • In our solar system, the impressive rings of Saturn, a planet around which more than 80 moons orbit, represent a relic of a primordial moon-forming disc.
    • The orange-colored star PDS 70, roughly the same mass as our Sun, is about 5 million years old– a blink of the eye in cosmic time.
    • The two planets are even younger. Both planets are similar (although larger) to Jupiter, a gas giant.
    • It was around one of the two planets, called PDS 70c, that a Moon-forming disc was observed.

    Observing birth of a moon: Core Accretion

    • Stars burst to life within clouds of interstellar gas and dust scattered throughout galaxies.
    • Leftover material spinning around a new star then coalesces into planets, and circumplanetary discs surrounding some planets similarly yield moons.
    • The dominant mechanism thought to underpin planet formation is called “core accretion”.
    • In this scenario, small dust grains, coated in ice, gradually grow to larger and larger sizes through successive collisions with other grains.
    • This continues until the grains have grown to a size of a planetary core, at which point the young planet has a strong enough gravitational potential to accrete gas which will form its atmosphere.
    • Some nascent planets attract a disc of material around them, with the same process that gives rise to planets around a star leading to the formation of moons around planets.
    • The disc around PDS 70c, with a diameter about equal to the distance of the Earth to the sun, possesses enough mass to produce up to three moons the size of Earth’s moon.

  • Near-Earth Asteroid Scout Mission

    Last week, NASA announced that its new spacecraft, named NEA Scout, has completed all required tests and has been safely tucked inside the Space Launch System (SLS) rocket.

    For landing on Moon

    • NEA Scout is one of several payloads that will hitch a ride on Artemis I, which is expected to be launched in November.
    • Artemis I will be an uncrewed test-flight of the Orion spacecraft and SLS rocket.
    • Under the Artemis programme, NASA has aimed to land the first woman on the Moon in 2024 and also establish sustainable lunar exploration programs by 2030.

    What is NEA Scout?

    • Near-Earth Asteroid Scout, or NEA Scout, is a small spacecraft, about the size of a big shoebox. Its main mission is to fly by and collect data from a near-Earth asteroid.
    • It will also be America’s first interplanetary mission using special solar sail propulsion.
    • This type of propulsion is especially useful for small, lightweight spacecraft that cannot carry large amounts of conventional rocket propellant.
    • NEA Scout will use stainless steel alloy booms and deploy an aluminium-coated sail measuring 925 square feet.
    • The large-area sail will generate thrust by reflecting sunlight.
    • Energetic particles of sunlight bounce off the solar sail to give it a gentle, yet constant push.

    How will it study the asteroid?

    • NEA Scout is equipped with special cameras and can take pictures ranging from 50 cm/pixels to 10 cm/pixels.
    • It can also process the image and reduce the file sizes before sending them to the earth-based Deep Space Network via its medium-gain antenna.
    • The spacecraft will take about two years to cruise to the asteroid and will be about 93 million miles away from Earth during the asteroid encounter.

    Why should we study near-Earth asteroids?

    • Despite their size, some of these small asteroids could pose a threat to Earth.
    • Understanding their properties could help us develop strategies for reducing the potential damage caused in the event of an impact.
    • Scientists will use this data to determine what is required to reduce risk, increase effectiveness, and improve the design and operations of robotic and human space exploration.

  • What is Suborbital Flight?

     

    Virgin Group founder Richard Branson became the first billionaire to fly to the edge of space and back, riding aboard his own Virgin Galactic spacecraft in a suborbital flight.

    What is Suborbital Flight?

    • When an object travels at a horizontal speed of about 28,000 km/hr or more, it goes into orbit once it is above the atmosphere.
    • Satellites need to reach that threshold speed in order to orbit Earth.
    • Such a satellite would be accelerating towards the Earth due to gravity, but its horizontal movement is fast enough to offset the downward motion so that it moves along a circular path.
    • Any object travelling slower than 28,000 km/hr must eventually return to Earth.
    • These are suborbital flights, because they will not be travelling fast enough to orbit Earth once they reach there.
    • Such a trip allows space travellers to experience a few minutes of “weightlessness”.

    Analogical example

    • For an analogy, consider a cricket ball thrown into the air.
    • Given that no human hand can give it a speed of 28,000 km/hr (about 8 m/sec), the ball will fly in an arc until its entire kinetic energy is swapped with potential energy.
    • At that instant, it will lose its vertical motion momentarily, before returning to Earth under the influence of gravity.
    • A suborbital flight is like this cricket ball, but travelling fast enough to reach the “edge of space”, and yet without enough horizontal velocity to go into orbit.
    • If an object travels as fast as 40,000 km/hr, it will achieve escape velocity, and never return to Earth.

    Why the buzz?

    • With Branson and Jeff Bezos kicking off private space flight, several companies are looking for customers wanting to go on suborbital or even orbital journeys.
    • At Branson’s Virgin Galactic, around 600 people have already paid deposits for tickets that are priced up to $250,000 (Rs 1.86 crore).
    • However, Bezos’s Blue Origin, which uses the reusable New Shepard rocket, is yet to announce commercialization plans, according to the BBC.
    • There is also excitement among scientists who want to use suborbital flights for microgravity research.
    • Such flights would be far less expensive than carrying experiments and people to the International Space Station.
    • Suborbital flights could also be an alternative to parabolic flights in airplanes that space agencies currently use to simulate zero gravity.

    Safety concerns

    • The Branson flight comes seven years after his company’s first rocket, called Enterprise, crashed during a test flight, killing one of the pilots on board.
    • The other survived after parachuting out.
    • The current rocket is also not certified by the US Federal Aviation Administration, which is prohibited to do so by law until 2023.
    • This is because the US government does not want to burden companies like Virgin Atlantic with regulations during their “learning” period, when they can innovate by trying out different designs and procedures.
    • Passengers who go on such trips need to sign “informed consent” forms, similar to the ones before going for skydiving or bungee jumping.

  • Possibility of life on Saturn’s Moon

    NASA’s Cassini spacecraft has detected an unusually high concentration of methane, along with carbon dioxide and dihydrogen, in the moons of Saturn by flying through their plumes.

    What is the new observation?

    • The spacecraft has found that Titan has methane in its atmosphere and Enceladus has a liquid ocean with erupting plumes of gas and water.

    Are there methane-producing organisms on Earth?

    • Most of the methane on Earth has a biological origin.
    • Microorganisms called methanogens are capable of generating methane as a metabolic byproduct.
    • They do not require oxygen to live and are widely distributed in nature.
    • They are found in swamps, dead organic matter, and even in the human gut.
    • They are known to survive in high temperatures and simulation studies have shown that they can live in Martian conditions.
    • Methanogens have been widely studied to understand if they can be a contributor to global warming.

    Could there be methanogens on Enceladus?

    • We cannot conclude that life exists in the Enceladus ocean.
    • It is the probability that Enceladus’ hydrothermal vents could be habitable to Earth-like microorganisms.
    • There can be life hypotheses.

    What other processes could have produced the methane?

    • Methane could be formed by the chemical breakdown of organic matter present in Enceladus’ core.
    • Hydrothermal processes could help the formation of carbon dioxide and methane.
    • On Earth, hydrothermal vents on seafloors are known to release methane, but this happens at a very slow rate.
    • This hypothesis is plausible but only if Enceladus was formed through the accretion of organic-rich material from comets.
    • The results suggest that methane production from hydrothermal vents is not sufficient to explain the high methane concentration detected by Cassini in the plumes.
    • An additional amount of methane produced via biological methanogenesis could match Cassini’s observations.

  • Discrete Auroras on Mars

    The UAE’s Hope spacecraft, which is orbiting Mars since February this year, has captured images of glowing atmospheric lights in the Red Planet’s night sky, known as discrete auroras.

    What causes an Aurora on Earth?

    • Auroras are caused when charged particles ejected from the Sun’s surface — called the solar wind — enter the Earth’s atmosphere.
    • These particles are harmful, and our planet is protected by the geomagnetic field, which preserves life by shielding us from the solar wind.
    • However, at the north and south poles, some of these solar wind particles are able to continuously stream down, and interact with different gases in the atmosphere to cause a display of light in the night sky.
    • This display, known as an aurora, is seen from the Earth’s high latitude regions (called the auroral oval), and is active all year round.

    Where are they observed on Earth?

    • In the northern part of our globe, the polar lights are called aurora borealis or Northern Lights and are seen from the US (Alaska), Canada, Iceland, Greenland, Norway, Sweden and Finland.
    • In the south, they are called aurora australis or southern lights and are visible from high latitudes in Antarctica, Chile, Argentina, New Zealand and Australia.

    So, how are Martian auroras different?

    • Unlike auroras on Earth, which are seen only near the north and south poles, discrete auroras on Mars are seen all around the planet at night time.
    • Unlike Earth, which has a strong magnetic field, the Martian magnetic field has largely died out.
    • This is because the molten iron at the interior of the planet– which produces magnetism– has cooled.
    • However, the Martian crust, which hardened billions of years ago when the magnetic field still existed, retains some magnetism.
    • So, in contrast with Earth, which acts like one single bar magnet, magnetism on Mars is unevenly distributed, with fields strewn across the planet and differing in direction and strength.
    • These disjointed fields channel the solar wind to different parts of the Martian atmosphere, creating “discrete” auroras over the entire surface of the planet as charged particles interact with atoms and molecules in the sky– as they do on Earth.

    Why is it important to study them?

    • Studying Martian auroras is important for scientists, for it can offer clues as to why the Red Planet lost its magnetic field and thick atmosphere– among the essential requirements for sustaining life.

    Answer this PYQ in the comment box:

    Q.Which region of Mars has a densely packed river deposit indicating this planet had water 3.5 billion years ago?

    (a) Aeolis Dorsa

    (b) Tharsis

    (c) Olympus Mons

    (d) Hellas

    Back2Basics:

    Hope Orbiter

    • The Hope Probe, the Arab world’s first mission to Mars, took off from Earth in July last year, and has been orbiting the Red Planet since February.
    • The primary objective of the mission is to study Martian weather dynamics.
    • By correlating the lower atmosphere and upper atmosphere conditions, the probe will look into how weather changes the escape of hydrogen and oxygen into space.
    • By measuring how much hydrogen and oxygen is spilling into space, scientists will be able to look into why Mars lost so much of its early atmosphere and liquid water.
    • It is expected to create the first complete portrait of the planet’s atmosphere.
    • With the information gathered during the mission, scientists will have a better understanding of the climate dynamics of different layers of Mars’ atmosphere.

    Mars

    • Mars is the fourth planet from the Sun and the second-smallest planet in the Solar System, being larger than only Mercury.
    • In English, Mars carries the name of the Roman god of war and is often referred to as the “Red Planet”.
    • The latter refers to the effect of the iron oxide prevalent on Mars’s surface, which gives it a reddish appearance distinctive among the astronomical bodies visible to the naked eye.
    • Mars is a terrestrial planet with a thin atmosphere, with surface features reminiscent of the impact craters of the Moon and the valleys, deserts and polar ice caps of Earth.
    • The days and seasons are comparable to those of Earth, because the rotational period, as well as the tilt of the rotational axis relative to the ecliptic plane, is similar.
    • Mars is the site of Olympus Mons, the largest volcano and highest known mountain on any planet in the Solar System, and of Valles Marineris, one of the largest canyons in the Solar System.

  • Black Hole swallows Neutron Star

    In an entirely strange phenomenon, astronomers have spotted two neutron stars being swallowed by different black holes.

    What are Black Holes?

    • A black hole is a region of spacetime where gravity is so strong that nothing—no particles or even electromagnetic radiation such as light—can escape from it.
    • Neutron stars and black holes are among the most extreme objects in the universe. They are the fossil relics of massive dead stars.
    • When a star that is more than eight times as massive as the Sun runs out of fuel, it undergoes a spectacular explosion called a supernova.
    • What remains can be a neutron star or a black hole.

    There is no upper limit to how massive a black hole can be, but all black holes have two things in common: a point of no return at their surface called an “event horizon”, from which not even light can escape and a point at their centre called a “singularity”, at which the laws of physics as we understand them break down.

    What about Neutron stars?

    • Neutron stars are typically between 1.5 and two times as massive as the Sun but are so dense that all their mass is packed into an object the size of a city.
    • At this density, atoms can no longer sustain their structure and dissolve into a stream of free quarks and gluons: the building blocks of protons and neutrons.

    What is the news observation?

    • Gravitational waves are produced when celestial objects collide and the ensuing energy creates ripples in the fabric of space-time which carry all the way to detectors on Earth.
    • The reverberations from the two celestial objects were picked up using a global network of gravitational wave detectors.

    What makes this strange phenomenon?

    • This is the first time scientists have seen gravitational waves from a neutron star and a black hole.
    • Previous gravitational wave detections have spotted black holes colliding, and neutron stars merging but not one of each.

    Why study this?

    • Neutron star-black hole systems allow us to piece together the evolutionary history of stars.
    • Gravitational-wave astronomers are like stellar fossil-hunters, using the relics of exploded stars to understand how massive stars form, live and die.

    Answer this PYQ in the comment box:

    Q.“Event Horizon” is related to (CSP 2018):

    (a) Telescope

    (b) Black hole

    (c) Solar glares

    (d) None of the above

  • [pib] What are Gamma Ray Burst (GRB) Explosion?

    The emission from the most notable Gamma Ray Burst (GRB) explosion away from 4.5 billion light-years has been traced by Indian researchers.

    What are GRB Explosions?

    • GRBs are immensely energetic explosions that have been observed in distant galaxies.
    • They are the brightest and most energetic electromagnetic events known to occur in the universe.
    • Bursts can last from ten milliseconds to several hours.
    • After an initial flash of gamma rays, a longer-lived “afterglow” is usually emitted at longer wavelengths (X-ray, ultraviolet, optical, infrared, microwave and radio).
    • The intense radiation of most observed GRBs is thought to be released during a supernova or superluminous supernova as a high-mass star implodes to form a neutron star or a black hole.

    What makes GRB special?

    • The explosions are both extremely energetic (a typical burst releases as much energy in a few seconds as the Sun will in its entire 10-billion-year lifetime) and extremely rare.
    • All observed GRBs have originated from outside the Milky Way galaxy, although a related class of phenomena, soft gamma repeater flares, are associated with magnetars within the Milky Way.
    • It has been hypothesized that a gamma-ray burst in the Milky Way, pointing directly towards the Earth, could cause a mass extinction event.

    Answer this PYQ in the comment box:

    Q.Which of the following is/are cited by the scientists as evidence/evidences for the continued expansion of universe? (CSP 2012)
    1. Detection of microwaves in space
    2. Observation of red shift phenomenon in space
    3. Movement of asteroids in space
    4. Occurrence of supernova explosions in space
    Select the correct answer using the codes given below:

    (a) 1 and 2 only

    (b) 2 only

    (c) 1, 3 and 4

    (d) None of the above can be cited as evidence.

  • New Shephard rocket system for cost-effective access to space

    Last week, Amazon founder and billionaire Jeff Bezos’s space company called Blue Origin concluded the online auction for the first seat on New Shephard, a rocket system meant to take tourists to space.

    What is New Shephard?

    • New Shephard has been named after astronaut Alan Shephard – the first American to go to space – and offers flights to space over 100 km above the Earth and accommodation for payloads.
    • Essentially, it is a rocket system that has been designed to take astronauts and research payloads past the Karman line – the internationally recognized boundary of space.
    • The idea is to provide easier and more cost-effective access to space meant for purposes such as academic research, corporate technology development, and entrepreneurial ventures among others.
    • Apart from its academic and research-oriented goal, New Shephard will also allow space tourists to experience microgravity by taking them 100 km above the Earth.

    Its components

    • The rocket system consists of two parts, the cabin or capsule, and the rocket or the booster.
    • The cabin can accommodate experiments from small Mini Payloads up to 100 kg.
    • As per Blue Origin, the Mini Payloads provide easier space access to students, who are part of educational institutions that are developing their own space programs.
    • Further, the cabin is designed for six people and sits atop a 60 feet tall rocket and separates from it before crossing the Karman line, after which both vehicles fall back to the Earth.
    • All the six seats in the capsule are meant for passengers, each of whom gets their own window seat. The capsule is fully autonomous and does not require a pilot.

    How does it work?

    • The system is a fully reusable, vertical takeoff and vertical landing space vehicle that accelerates for about 2.5 minutes before the engine cuts off.
    • After separating from the booster, the capsule free falls in space, while the booster performs an autonomously controlled vertical landing back to Earth.
    • The capsule, on the other hand, lands back with the help of parachutes.

    A boost for space tourism

    • Space tourism seeks to give laypeople the ability to go to space for recreational, leisure, or business purposes.
    • The idea is to make space more accessible to those individuals who are not astronauts and want to go to space for non-scientific purposes.

  • Polar-Areas Stellar-Imaging in Polarisation High-Accuracy Experiment (PASIPHAE)

    The development of a vital instrument PASIPHAE, which will be used in upcoming sky surveys to study stars, is being led by an Indian astronomer.

    What is PASIPHAE?

    • PASIPHAE stands for Polar-Areas Stellar-Imaging in Polarisation High-Accuracy Experiment.
    • It is an international collaborative sky surveying project. Scientists aim to study the polarisation in the light coming from millions of stars.
    • The name is inspired by Pasiphae, the daughter of Greek Sun God Helios.
    • The survey will use two high-tech optical polarimeters to observe the northern and southern skies, simultaneously.
    • It will focus on capturing starlight polarisation of very faint stars that are so far away that polarisation signals from there have not been systematically studied.
    • By combining the data, astronomers will perform a maiden magnetic field tomography mapping of the interstellar medium of very large areas of the sky using a novel polarimeter instrument known as WALOP.

    Why is PASIPHAE important?

    • Since its birth about 14 billion years ago, the universe has been constantly expanding, as evidenced by the presence of Cosmic Microwave Background (CMB) radiation which fills the universe.
    • Immediately after its birth, the universe went through a short inflationary phase during which it expanded at a very high rate before it slowed down and reached the current rate.
    • However, so far, there have only been theories and indirect evidence of expansion associated with the early universe.
    • A definitive consequence of the inflationary phase is that a tiny fraction of the CMB radiation should have its imprints in the form of a specific kind of polarisation (known scientifically as a B-mode signal).
    • All previous attempts to detect this signal met with failure mainly due to the difficulty posed by our galaxy, the Milky Way, which emits copious amounts of polarized radiation.
    • Besides, it contains a lot of dust clouds that are present in the form of clusters. When starlight passes through these dust clouds, they get scattered and polarized.

    What will PASIPHAE do?

    • The PASIPHAE survey will measure starlight polarisation over large areas of the sky.
    • This data along with distances to the stars will help create a 3-Dimensional model of the distribution of the dust and magnetic field structure of the galaxy.
    • Such data can help remove the galactic polarized foreground light and enable astronomers to look for the elusive B-mode signal.

    What is WALOP?

    • Wide Area Linear Optical Polarimeter (WALOP) is an instrument when mounted on two small optical telescopes, that will be used to detect polarized light signals emerging from the stars along high galactic latitudes.
    • The images will simultaneously have the finest of details of a star along with its panoramic background.
    • WALOP will operate on the principle that at any given time, the data from a portion of the sky under observation will be split into four different channels.
    • Depending on the manner in which light passes through the four channels, the polarisation value from the star is obtained.
    • That is, each star will have four corresponding images which when stitched together will help calculate the desired polarisation value of a star.

  • EnVision Mission to Venus

    Following NASA’s footsteps, the European Space Agency (ESA) announced that it has selected EnVision as its next orbiter that will visit Venus sometime in the 2030s.

    Last week, NASA selected two missions to the planet Venus, Earth’s nearest neighbour. The missions called DAVINCI+ and VERITAS have been selected based on their potential for scientific value and the feasibility of their development plans.

    What is EnVision?

    • EnVision is an ESA-led mission with contributions from NASA. It is likely to be launched sometime in the 2030s.
    • The earliest launch opportunity for EnVision is 2031, followed by 2032 and 2033.
    • Once launched on an Ariane 6 rocket, the spacecraft will take about 15 months to reach Venus and will take 16 more months to achieve orbit circularization.
    • The spacecraft will carry a range of instruments to study the planet’s atmosphere and surface, monitor trace gases in the atmosphere and analyses its surface composition.

    What are other such missions?

    • EnVision will follow another ESA-led mission to Venus called ‘Venus Express’ (2005-2014) that focused on atmospheric research and pointed to volcanic hotspots on the planet’s surface.
    • Other than this, Japan’s Akatsuki spacecraft has also been studying the planet’s atmosphere since 2015.

    Why are scientists interested in studying Venus?

    • At the core of the ESA’s mission is the question of how Earth and Venus evolved so differently from each other considering that they are roughly of the same size and composition.
    • Venus is the hottest planet in the solar system because of the heat that is trapped by its thick cloud cover.
    • Last year, a team of scientists reported that they had found phosphine gas (a chemical produced only through biological processes) in the atmosphere of Venus.
    • This triggered excitement in the scientific community that some life forms might be supported by the planet.
    • But the existence of life on the planet is nearly impossible given the high temperatures of Venus and its acidic atmosphere.

    Back2Basics: Venus Planet

    • For those on Earth, Venus is the second-brightest object in the sky after the moon.
    • It appears bright because of its thick cloud cover that reflects and scatters light.
    • But while Venus, which is the second closest planet to the Sun, is called the Earth’s twin because of their similar sizes, the two planets have significant differences between them.
    • For one, the planet’s thick atmosphere traps heat and is the reason that it is the hottest planet in the solar system, despite coming after Mercury, the closest planet to the Sun.
    • Surface temperatures on Venus can go up to 471 degrees Celsius, which is hot enough to melt lead.
    • Further, Venus moves forward on its orbit around the Sun but spins backwards around its axis slowly.
    • This means on Venus the Sun rises in the west and sets in the East.
    • One day on Venus is equivalent to 243 Earth days because of its backward spinning, opposite to that of the Earth’s and most other planets.
    • Venus also does not have a moon and no rings.