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Subject: Space Technology

  • Proxima Centauri: the closest star to the Sun

    Astronomers running the world’s largest initiative to look for alien life have recently picked up an “intriguing” radio wave emission from the direction of Proxima Centauri, the closest star to our Sun.

    Proxima Centauri

    • Proxima Centauri is 4.2 light-years away from the Sun – considered a close distance in cosmic terms.
    • Its mass is about an eighth of the Sun’s, and it is too dim to be seen with the naked eye from Earth.
    • Proxima b, one of the two planets that revolve around the star, is the subject of significant curiosity.
    • Sized 1.2 times larger than Earth, and orbits its star every 11 days, Proxima b lies in Proxima Centauri’s “Goldilocks zone”.

    Goldilocks zone is the area around a star where it is not too hot and not too cold for liquid water to exist on the surface of surrounding planets. To give an example, the Earth is in the Sun’s Goldilocks zone.

    The mystery of radio signals

    • Astronomers at the Breakthrough Listen project, started by the legendary physicist Stephen Hawking, regularly spot blasts of radio waves using two powerful telescopes.
    • They are Parkes Observatory in Australia or the Green Bank Observatory in the US.
    • All of their findings so far, though, have been attributed either to natural sources or interference caused by humans.
    • This raises the possibility that the emission could be an alien “techno-signature”, meaning something which provides evidence of alien technology.
    • There are also reasons to believe that the signal might not mean ‘aliens’.
    • Another possibility could be that the signal could have been caused by something behind Proxima Centauri or by a natural phenomenon whose existence we so far do not know of.

  • Christmas-Star Conjunction of Saturn and Jupiter

    After nearly 400 years, Saturn and Jupiter – the two largest planets in our solar system – will be brought closest in the night sky by an astronomical event called the “great conjunction” and popularly referred to as the “Christmas Star”.

    Try this PYQ:

    What is a coma, in the context of Astronomy?

    (a) Bright half of material on the comet

    (b) Long tail of dust

    (c) Two asteroids orbiting each other

    (d) Two planets orbiting each other

    What are the Conjunctions?

    • A conjunction is not unique to Saturn and Jupiter however, it is the name given to any event where planets or asteroids appear to be very close together in the sky when viewed from the Earth.
    • In June 2005 for instance, as a result of the “spectacular” conjunction, Mercury, Venus and Saturn appeared so close together in the sky that the patch of sky where the three planets were could be covered by a thumb.
    • Astronomers use the word “great” for the conjunction of Jupiter and Saturn because of the planets’ sizes.

    The “Great Conjunction”

    • It happens once in about 20 years because of the time each of the planets takes to orbit around the Sun.
    • Jupiter takes roughly 12 years to complete one lap around the Sun and Saturn takes 30 years.
    • This is because Saturn has a larger orbit and moves more slowly because it is not as strongly influenced by the Sun’s gravitational force as planets that are closer to the Sun.
    • As the two planets move along their orbits, every two decades, Jupiter catches up with Saturn resulting in what astronomers call the great conjunction.

    A ‘rare alignment’

    • Jupiter and Saturn are bright planets and can be typically seen with the naked eye even from cities.
    • But during conjunction, they appear to be close to each other, which is what makes the event noteworthy.
    • The event will coincide with the winter solstice (shortest day of the year in terms of hours of sunlight received) in the Northern Hemisphere and summer solstice in the Southern Hemisphere.
    • This year, however, the event is rare because the planets will come the closest to each other in nearly four centuries; in what astronomer Henry Throop described is a result of a “rare alignment” of the planets.

  • CMS-01 Satellite launched by ISRO

    The Indian Space Research Organisation (ISRO) successfully placed into a transfer orbit India’s 42nd communications satellite, CMS-01, carried onboard the PSLV-C50.

    CMS-01

    • It is a communications satellite envisaged for providing services in extended C Band of the frequency spectrum and its coverage will include the Indian mainland and the Andaman & Nicobar and Lakshadweep islands, the ISRO.
    • The satellite is expected to have a life of over seven years.
    • It was injected precisely into its pre-defined sub- geostationary transfer orbit (GTO).
    • CMS-01 is considered to be a replacement of the aged satellite GSAT-12. It provides services like tele-education, tele-medicine, disaster management support and Satellite Internet access.

    What is GTO?

    • A geosynchronous transfer orbit or geostationary transfer orbit (GTO) is a type of geocentric orbit.
    • Satellites which are destined for geosynchronous (GSO) or geostationary orbit (GEO) are (almost) always put into a GTO as an intermediate step for reaching their final orbit.
    • A GTO is highly elliptic.
    • Its perigee (closest point to Earth) is typically as high as low Earth orbit (LEO), while its apogee (furthest point from Earth) is as high as geostationary (or equally, a geosynchronous) orbit.

  • Chang’e 5 returns to Earth carrying moon rocks

    A Chinese lunar capsule has returned to Earth with the first fresh samples of rock and debris from the moon in more than 40 years.

    Try this PYQ:

    Q.What do you understand by the term Aitken basin:

    (a) It is a desert in the southern Chile which is known to be the only location on earth where no rainfall takes place

    (b) It is an impact crater on the far side of the Moon

    (c) It is a Pacific coast basin, which is known to house large amounts of oil and gas

    (d) It is a deep hyper saline anoxic basin where no aquatic animals are found

    Chang’e-5 Probe

    • The Chang’e-5 probe, named after the mythical Chinese moon goddess, aims to shovel up lunar rocks and soil to help scientists learn about the moon’s origins, formation and volcanic activity on its surface.
    • The goal of the mission is to land in the Mons Rumker region of the moon, where it will operate for one lunar day, which is two weeks long.
    • It will collect 2 kg of surface material from a previously unexplored area known as Oceanus Procellarum — or “Ocean of Storms” — which consist of vast lava plain.
    • The original mission, planned for 2017, was delayed due to an engine failure in China’s Long March 5 launch rocket.

    A big achievement

    • The successful mission was the latest breakthrough for China’s increasingly ambitious space programme that includes a robotic mission to Mars and plans for a permanent orbiting space station.
    • This return marked China’s third successful lunar landing but the only one to lift off again from the moon.
    • It also marked the first time scientists have obtained fresh samples of lunar rocks since the former Soviet Union’s Luna 24 robot probe in 1976.

    Significance of the mission

    • Rocks found on the Moon are older than any that have been found on Earth and therefore they are valuable in providing information about the Earth and the Moon’s shared history.
    • Lunar samples can help to unravel some important questions in lunar science and astronomy, including the Moon’s age, its formation, the similarities and differences between the Earth and the Moon’s geologic features.
    • For instance, the shape, size, arrangement and composition of individual grains and crystals in a rock can tell scientists about its history, while the radioactive clock can tell them the rock’s age.
    • Further, tiny cracks in rocks can tell them about the radiation history of the Sun in the last 100,000 years.

  • Galaxy NGC 6240

    NASA’s Chandra X-ray Observatory shared the images of Galaxy NGC 6240 that contains two supermassive Black Holes in the process of merging.

    From astronomers to general space enthusiasts, black holes are a topic of interest for many. If you’re someone who spends a lot of their time researching facts about this region of space-time or watching videos on the same, then you must check out this news.

    Galaxy NGC 6240

    • The black holes, located in Galaxy NGC 6240 are 3,000 light-years apart and they will drift together to form a larger black hole millions of years from now.
    • As per a blog post by the observatory, the merging process began some 30 million years ago
    • The pairs of massive black holes in the process of merging are expected to be the most powerful sources of gravitational waves in the Universe.
    • Seen as the bright ‘dots’ near the centre of this image, the black holes are just 3,000 light-years apart.

    About Chandra X-ray Observatory

    • It is a telescope specially designed to detect X-ray emissions from very hot regions of the universe such as exploded stars, clusters of galaxies, and matter around black holes.
    • Orbiting at 139,000 km in space, the telescope was launched aboard the Space Shuttle Columbia during STS-93 by NASA in 1999.

  • Surveyor-2 Spacecraft

    NASA has confirmed that the Near-Earth Object called 2020 SO is the rocket booster that helped lift the space agency’s Surveyor spacecraft toward the Moon in 1966.

    Try this PYQ:

    Consider the following phenomena:

    1. Size of the sun at dusk
    2. Colour of the sun at dawn
    3. Moon being visible at dawn
    4. Twinkle of stars in the sky
    5. Polestar being visible in the sky

    Which of the above are optical illusions?

    (a) 1, 2 and 3

    (b) 3, 4 and 5

    (c) 1, 2 and 4

    (d) 2, 3 and 5

    What is Surveyor-2?

    • The Surveyor-2 spacecraft was supposed to make a soft landing on the Moon’s surface in September 1966, during which time one of the three thrusters failed to ignite.
    • As a result of this the spacecraft started spinning and crashed on the surface.
    • The aim of the mission was to reconnoiter the lunar surface ahead of the Apollo missions that led to the first lunar landing in 1969.
    • While the spacecraft crashed into the Moon’s surface, the rocket booster disappeared into an unknown orbit around the Sun.

    How was the object determined to be the rocket booster?

    • Astronomers track asteroids using telescope to determine if there are potentially hazardous asteroids that pose a threat to the planet.
    • Therefore, it is also important for them to be able to distinguish between natural and artificial objects that orbit around the Sun.
    • The rocket booster has come “somewhat close” to the Earth in the past few decades.
    • One approach to the Earth in late 1966 was so close that the object was thought to have originated from Earth.
    • In September, the NASA-funded telescope detected it.

  • Arecibo Radio Telescope

    A massive radio telescope at Puerto Rico’s Arecibo Observatory — one of the world’s largest — collapsed on after sustaining severe damage, following 57 years of astronomical discoveries.

    Try this PYQ:

    Which of the following is/are cited by the scientists as evidence/evidence for the continued expansion of the universe?

    1. Detection of microwaves in space
    2. Observation of redshirt phenomenon in space
    3. Movement of asteroids in space
    4. Occurrence of supernova explosions in space

    Codes:

    (a) 1 and 2 only

    (b) 2 only

    (c) 1, 3 and 4

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

    Arecibo Telescope

    • The Arecibo Observatory, also known as the National Astronomy and Ionosphere Center (NAIC), was an observatory in Arecibo, Puerto Rico owned by the US National Science Foundation (NSF).
    • It was the world’s largest single-aperture telescope for 53 years, surpassed in July 2016 by the Five-hundred-meter Aperture Spherical Telescope (FAST) in China.
    • The second-largest single-dish radio telescope in the world, it had withstood many hurricanes and earthquakes since it was first built in 1963.

    Its contributions

    • Being the most powerful radar, scientists employed Arecibo to observe planets, asteroids and the ionosphere.
    • It made several discoveries over the decades, including finding prebiotic molecules in distant galaxies, the first exoplanets, and the first millisecond pulsar.
    • In 1967, Arecibo was able to discover that the planet Mercury rotates in 59 days and not 88 days as had been originally thought.
    • In the following decades, it also served as a hub in the search for extraterrestrial life, and would look for radio signals from alien civilizations.
    • In 1993, scientists Russell Hulse and Joseph Taylor were awarded the Nobel Prize in Physics for their work on the observatory in monitoring a binary pulsar.
    • It provided a strict test of Einstein’s Theory of General Relativity and the first evidence for the existence of gravitational waves.

  • Australian Square Kilometre Array Pathfinder (ASKAP)

    A powerful new telescope ASKAP, in Australia has mapped vast areas of the universe in record-breaking time, revealing a million new galaxies and opening the way to new discoveries.

    Note all important telescopes in news and their features. Some of them are – Thirty Meter Telescope, Giant Metrewave Radio Telescope, Spitzer, Chandra etc.

    What is ASKAP?

    • ASKAP is a telescope designed over a decade ago and located about 800 km north of Perth.
    • It became fully operational in February 2019 and is currently conducting pilot surveys of the sky before it can begin large-scale projects from 2021 onward.
    • ASKAP surveys are designed to map the structure and evolution of the Universe, which it does by observing galaxies and the hydrogen gas that they contain.
    • One of its most important features is its wide field of view, because of which it has been able to take panoramic pictures of the sky in great detail.
    • The telescope uses novel technology developed by CSIRO- the Australian space agency, which is a kind of a “radio camera” to achieve high survey speeds and consists of 36 dish antennas, which are each 12m in diameter.
    • The survey team has been able to observe over 83 per cent of the sky visible from ASKAP’s site in Western Australia.

    Significance of the results

    • The present Rapid ASKAP Continuum Survey (RACS) taken by the ASKAP telescope is like a “Google map” of the Universe.
    • Mapping the Universe on such a scale enables astronomers to study the formation of stars and how galaxies and their supermassive black holes evolve and interact with each other.
    • Significantly, the images the telescope has taken are on average deeper and have better spatial resolution compared to those taken during other surveys of the sky.
    • The aim of the RACS survey is to generate images that will aid future surveys undertaken using the telescope.

  • Japan’s Hayabusa2 Probe

    A Japanese spacecraft is nearing Earth after a yearlong journey home from a distant asteroid with soil samples. It is set to land in Australia.

    Try this PYQ:

    Which of the following is/are cited by the scientists as evidence/evidence for the continued expansion of the universe?

    1. Detection of microwaves in space
    2. Observation of redshirt phenomenon in space
    3. Movement of asteroids in space
    4. Occurrence of supernova explosions in space

    Codes:

    (a) 1 and 2 only

    (b) 2 only

    (c) 1, 3 and 4

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

    Hayabusa2 Probe

    • Hayabusa2is an asteroid sample-return mission operated by the Japanese space agency, JAXA.
    • It follows on from the Hayabusa mission which returned asteroid samples in 2010.
    • It was launched on 3 December 2014 and rendezvoused with near-Earth asteroid 162173 Ryugu on 27 June 2018.
    • It surveyed the asteroid for a year and a half and took samples. It left the asteroid in November 2019.
    • It carries multiple science payloads for remote sensing, sampling, and four small rovers that investigated the asteroid surface to inform the environmental and geological context of the samples collected.

  • Giant Metrewave Radio Telescope (GMRT)

    The Giant Metrewave Radio Telescope (GMRT) has been selected as a ‘Milestone’ facility by the U.S.-based Institute of Electrical and Electronics Engineers (IEEE).

    Note: GMRT is not an ISRO mission.

    About GMRT

    • The GMRT located near Pune is an array of thirty fully steerable parabolic radio telescopes of 45-metre diameter, observing at metre wavelengths.
    • It is operated by the National Centre for Radio Astrophysics (NCRA), a part of the Tata Institute of Fundamental Research, Mumbai.
    • It was conceived and built under the direction of Late Prof. Govind Swarup from 1984 to 1996.
    • At the time it was built, it was the world’s largest interferometric array offering a baseline of up to 25 kilometres (16 mi).
    • Astronomers from all over the world regularly use this telescope to observe many different astronomical objects such as HII regions (interstellar atomic hydrogen that is ionized), galaxies, pulsars, supernovae, and Sun and solar winds.

    A significant feat

    • IEEE is the world’s largest technical professional organisation dedicated to advancing technology in all areas related to electrical and electronics engineering.
    • The IEEE Milestones programme honours significant technical achievements which have a global or regional impact. This is only the third such IEEE ‘Milestone’ recognition for an Indian contribution.
    • The previous two Indian IEEE Milestones were for the pioneering work done by Sir J.C. Bose to demonstrate the generation and reception of radio waves in 1895 (recognised in 2012), and for the Nobel Prize-winning (in 1930) ‘scattering of light’ phenomenon observed by Sir C.V. Raman in 1928.