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Subject: Space Technology

  • Matosinhos Manifesto for accelerated use of space in Europe

    The European Space Agency (ESA) has approved a Matosinhos Manifesto to accelerate the use of space in Europe.

    Matosinhos Manifesto

    • At the Intermediate Ministerial Meeting that was held in Matosinhos, Portugal.
    • The Council of Ministers unanimously adopted this resolution that lays down a vision for the continent in terms of maintaining and expanding its activities in space.
    • The large-scale nature and fast pace of the climate crisis and other challenges means that no European nation will be able to effectively address them alone.

    The manifesto defines three “accelerators” to further advance Europe’s space ambitions:

    1. The first of these accelerators is for the ESA to start working towards the “Space for a Green Future”
    2. The second accelerator is called “Rapid and Resilient Crisis Response” to support governments to act decisively on crises facing Europe, from flooding and storms to wildfires
    3. The third accelerator mentioned in the resolution is “Protection of Space Assets”, whose objective is to safeguard ESA astronauts and assets from interference by space debris and space weather

    A brief history of the ESA

    • The ESA is an intergovernmental organization that was formed in 1975 with the aim of developing Europe’s space capabilities.
    • The organization has 22 member states — Austria, Belgium, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Ireland, Italy, Luxembourg, the Netherlands, Norway, Poland, Portugal, Romania, Spain, Sweden, Switzerland and the UK.
    • Slovenia, Latvia and Lithuania are Associate Members.

     

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  • NASA’s DART mission to hit and deflect an Asteroid

    NASA will launch the agency’s first planetary defense test mission named the Double Asteroid Redirection Test (DART).

    What is DART Mission?

    • The main aim of the mission is to test the newly developed technology that would allow a spacecraft to crash into an asteroid and change its course.
    • It is a suicide mission and the spacecraft will be completely destroyed.
    • The target of the spacecraft is a small moonlet called Dimorphos (Greek for “two forms”).
    • It is about 160-metre in diameter and the spacecraft is expected to collide when it is 11 million kilometres away from Earth.
    • Dimorphos orbits a larger asteroid named Didymos (Greek for “twin”) which has a diameter of 780 metres.

    Is there any threat from this asteroid?

    • The asteroid and the moonlet do not pose any threat to Earth and the mission is to test the new technology to be prepared in case an asteroid head towards Earth in the future.
    • The spacecraft will navigate to the moonlet and intentionally collide with it at a speed of about 6.6 kilometres per second or 24,000 kilometres per hour.

    Why Dimorphos?

    • Didymos is a perfect system for the test mission because it is an eclipsing binary which means it has a moonlet that regularly orbits the asteroid.
    • It is observable when it passes in front of the main asteroid.
    • Earth-based telescopes can study this variation in brightness to understand how long it takes Dimorphos to orbit Didymos.

    How big is the spacecraft?

    • NASA states that DART is a low-cost spacecraft, weighing around 610 kg at launch and 550 kg during impact.
    • The main structure is a box (1.2 × 1.3 × 1.3 metres). It has two solar arrays and uses hydrazine propellant for manoeuvring the spacecraft.

     

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  • What is White Dwarf?

    Using the Hubble Space telescope and Transiting Exoplanet Survey Satellite (TESS), astronomers have identified several white dwarfs over the years.

    Where is this white dwarf?

    • A white dwarf is what stars like the Sun become after they have exhausted their nuclear fuel.
    • Near the end of its nuclear burning stage, this type of star expels most of its outer material, creating a planetary nebula.
    • Only the hot core of the star remains. This core becomes a very hot white dwarf, with a temperature exceeding 100,000 Kelvin.
    • Unless it is accreting matter from a nearby star, the white dwarf cools down over the next billion years or so.

    Limits for white dwarf

    • White Dwarf is half the size of our Sun and has a surface gravity 100,000 times that of Earth.
    • There is a limit on the amount of mass a white dwarf can have.
    • Subrahmanyan Chandrasekhar discovered this limit to be 4 times the mass of the Sun. This is appropriately known as the “Chandrasekhar Limit.”

    Observing white dwarf

    • Many nearby, young white dwarfs have been detected as sources of soft, or lower-energy, X-rays.
    • Recently, soft X-ray and extreme ultraviolet observations have become a powerful tool in the study the composition and structure of the thin atmosphere of these stars.

    What is TESS?

    • The researchers observed this phenomenon using Transiting Exoplanet Survey Satellite (TESS).
    • TESS is a space telescope in NASA’s Explorer program, designed to search for extrasolar planets using the transit method.
    • The primary mission objective for TESS is to survey the brightest stars near the Earth for transiting exoplanets over a two-year period.
    • The TESS project will use an array of wide-field cameras to perform an all-sky survey. It will scan nearby stars for exoplanets.

    How does white dwarf ‘switch on and off’?

    • In these types of systems, the donor star orbit around the white dwarf keeps feeding the accretion disk.
    • As the accretion disk material slowly sinks closer towards the white dwarf it generally becomes brighter.
    • It is known that in some systems the donor stars stop feeding the disk.

     

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  • What is the Lucy Mission?

    The NASA has launched Lucy, the spacecraft on a 12-year cruise to look back into the origins of the solar system through Trojans.

    Lucy Mission

    • Lucy will fly by eight Jupiter asteroids—seven Trojans and one main-belt asteroid — over the next 12 years.
    • It is NASA’s first single spacecraft mission in history to explore so many different asteroids.
    • Lucy will run on solar power out to 850 million kilometers away from the Sun.
    • This makes it the farthest-flung solar powered spacecraft ever, according to NASA.

    What is Jupiter Trojan Asteroids?

    • Simply known as Trojans, they are a large group of asteroids that share Jupiter’s orbit around the Sun.
    • Thousands of such asteroids exist in a gravitationally stable space.
    • The swarms lead and follow the planet Jupiter along its orbit around the Sun.

    What exactly are Trojans?

    • Lucy’s Trojan destinations are trapped near Jupiter’s Lagrange (L) points, which are gravitationally stable locations — it is where the gravity from the Sun and from Jupiter cancel each other out.
    • This means their orbits are stable and the Trojans are trapped in the space between.
    • This also means that asteroids are as far away from Jupiter as they are from the Sun.
    • Jupiter’s leading and trailing Lagrangian points (L4 and L5) have been stable over the age of the solar system.
    • This means that their orbits have accumulated many, many asteroids.
    • It makes sense to call a Trojan a co-orbital object, which moves around one of the two stable Lagrangian points.

    When and how were they discovered?

    • It took many a scientist to understand Trojans, and subsequently, name them so.
    • A German astro-photographer in 1906 made an important discovery: An asteroid with a particularly unusual orbit. As Jupiter moved, this asteroid remained ahead of Jupiter.
    • It was observed that the asteroid was nearly 60 degrees in front of Jupiter.

    Students with engineering background would better understand who Lagrange was. Rest need not care.

    Lagrange’s propositions

    • This specific position of a peculiar behaviour was predicted by the Italian-French mathematician Joseph-Louis Lagrange over 100 years earlier.
    • Lagrange had argued that if a small celestial body is placed at one of two stable points in a planet’s orbit around the Sun (the L4 and L5), the asteroid would remain stationary from the planet’s perspective.
    • This is due to the combined gravitational forces of the planet and the Sun.
    • Thus, Lagrange’s prediction acquired credibility. More such asteroids were discovered over subsequent months in Jupiter’s Lagrange point L5.

    Behind the name: Lucy

    • It is the fossil of a hominin that lived 3.2 million years ago.
    • She is known to be one of the most famous pre-human fossil in history.
    • Nearly 40 per cent of the fossilised skeleton of this hominin was discovered in 1974 by a team of paleoanthropologists led by Donald Johanson.
    • The name was inspired from the famous Beatles song “Lucy in the Sky With Diamonds,” which Johanson’s team listened to at camp the night of their discovery.

     

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    Back2Basics: Lagrange Points

    • Lagrange points are positions in space where objects sent there tend to stay put.
    • They are named after Italian-French mathematician Josephy-Louis Lagrange.
    • At Lagrange points, the gravitational pull of two large masses precisely equals the centripetal force required for a small object to move with them.
    • These points in space can be used by spacecraft to reduce the fuel consumption needed to remain in position.
    • There are five special points where a small mass can orbit in a constant pattern with two larger masses.

     

  • James Webb: The most powerful space telescope

    On Dec 18, 2021, after years of delays, the James Webb Space Telescope is scheduled to launch into orbit and usher in the next era of astronomy.

    James Webb Space Telescope

    • JWST is a joint NASA–ESA–CSA space telescope that is planned to succeed the Hubble Space Telescope as NASA’s flagship astrophysics mission
    • It is the most powerful space telescope ever built.
    • It will enable a broad range of investigations across the fields of astronomy and cosmology, including observing some of the most distant events and objects in the universe,
    • It would help understand events such as the formation of the first galaxies, and detailed atmospheric characterization of potentially habitable exoplanets.

    Its significance

    • Some have called JSWT the “telescope that ate astronomy.”
    • It is said to look back in time to the Dark Ages of the universe.

    What does the ‘Dark Ages’ of the universe mean?

    • Evidence shows that the universe started with an event called the Big Bang 13.8 billion years ago, which left it in an ultra-hot, ultra-dense state.
    • The universe immediately began expanding and cooling after the Big Bang.
    • One second after the Big Bang, the universe was a hundred trillion miles across with an average temperature of an incredible 18 billion F (10 billion C).
    • Around 400,000 years after the Big Bang, the universe was 10 million light-years across and the temperature had cooled to 5,500 F (3,000 C).
    • Throughout this time, space was filled with a smooth soup of high-energy particles, radiation, hydrogen and helium.
    • There was no structure. As the expanding universe became bigger and colder, the soup thinned out and everything faded to black.

    This was the start of what astronomers call the Dark Ages of the universe.

    How will JWST study this?

    Ans. Looking for the first light

    • The Dark Ages ended when gravity formed the first stars and galaxies that eventually began to emit the first light.
    • Astronomers aim to study this fascinating and important era of the universe, but detecting first light is incredibly challenging.
    • Compared to massive, bright galaxies of today, the first objects were very small and due to the constant expansion of the universe, they’re now tens of billions of light years away from Earth.
    • Also, the earliest stars were surrounded by gas left over from their formation and this gas acted like fog that absorbed most of the light.
    • It took several hundred million years for radiation to blast away the fog. This early light is very faint by the time it gets to Earth.

    Try this PYQ:

    Consider the following phenomena:

    1. Light is affected by gravity.
    2. The Universe is constantly expanding.
    3. Matter warps its surrounding space-time.

    Which of the above is/are the predictions of Albert Einstein’s General Theory of Relativity, often discussed in media?

    (a) 1 and 2 only

    (b) 3 only

    (c) 1 and 3 only

    (d) 1, 2 and 3

     

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  • Indian meteorite helps study Earth’s formation

    The researchers from the Geological Survey of India collected about 30 meteorite fragments with the largest weighing around a kilogram near the town of Katol in Nagpur in 2012.

    Significance of meteor study

    • Now, by studying the composition of these meteorite fragments, researchers have unraveled the composition expected to be present in the Earth’s lower mantle which is at about 660 km deep.
    • Studying the meteorite could also tell us more about how our Earth evolved from being a magma ocean to a rocky planet.

    Key component of the Meteor: Olivine

    • Initial studies revealed that the host rock was mainly composed of olivine, an olive-green mineral.
    • Olivine is the most abundant phase in our Earth’s upper mantle.
    • Our Earth is composed of different layers including the outer crust, followed by the mantle and then the inner core.

    How to study a meteorite?

    • The researchers took a small sample of the meteorite and examined it using special microscopy techniques.
    • The mineralogy was determined using a laser micro-Raman spectrometer.
    • These techniques helped the team identify, characterise the crystal structure of the meteorite and determine its chemical composition and texture.

    What does the new study show?

    • The international team of scientists examined a section of this highly-shocked meteorite. It resembles to the first natural occurrence of a mineral called bridgmanite.
    • The mineral was named in 2014 after Prof. Percy W. Bridgman, recipient of the 1946 Nobel Prize in Physics.
    • Various computational and experimental studies have shown that about 80% of the Earth’s lower mantle is made up of bridgmanite.
    • By studying this meteorite sample, scientists can decode how bridgmanite crystallized during the final stages of our Earth’s formation.

    Bridgmanite: On Earth vs. on Meteorite

    • Katol meteorite is a unique sample and it is a significant discovery.
    • The bridgmanite in the meteorite was found to be formed at pressures of about 23 to 25 gigapascals generated by the shock event.
    • The high temperature and pressure in our Earth’s interior have changed over billions of years causing crystallisation, melting, remelting of the different minerals before they reached their current state.
    • It is important to study these individual minerals to get a thorough idea of how and when the Earth’s layers formed.

    How does it help understand evolution of Earth?

    • The inner planets or terrestrial planets or rocky planets Mercury, Venus, Earth, and Mars are formed by accretion or by rocky pieces coming together.
    • They were formed as a planet by increased pressure and high temperature caused by radioactive elements and gravitational forces.
    • Our Earth was an ocean of magma before the elements crystallised and stabilised and the different layers such as core, mantle were formed.
    • The heavier elements like iron went to the core while the lighter silicates stayed in the mantle.
    • By using the meteorite as an analog for Earth, we can unearth more details about the formation.

    Answer this question from our AWE initiative:

    What are seismic waves? How have they helped in understanding the structure of the earth? (250 W/ 15 M)

     

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  • IAO Hanle: A promising astronomical observatory

    A new study shows that the Indian Astronomical Observatory (IAO) located in Hanle is one of the emerging sites for infrared and optical astronomy studies.

    About IAO Hanle

    • The IAO, located in Hanle at Mount Saraswati near Leh in Ladakh, has one of the world’s highest located sites for optical, infrared and gamma-ray telescopes.
    • It was established in 2001 and is operated by the Indian Institute of Astrophysics, Bangalore.
    • It is currently the ninth highest optical telescope in the world, situated at an elevation of 4,500 meters.

    Note: University of Tokyo Atacama Observatory (TAO) located in the Atacama desert of Chile is the highest at an elevation of 5,640 m.

    Major telescopes at Hanle include:

    1. Himalayan Chandra Telescope (An optical-infrared telescope named after India-born Nobel laureate Subrahmanyam Chandrasekhar)
    2. GROWTH-India Telescope (A robotic optical telescope)
    3. High Altitude Gamma Ray Telescope

    Distinct factors of IAO Hanle

    • IAO Hanle offers a clear view of space among all observatories globally.
    • This is due to its advantages of more clear nights, minimal light pollution, background aerosol concentration, extremely dry atmospheric condition and uninterrupted monsoon.
    • Hanle site is as dry as Atacama Desert in Chile and much drier than Devasthal and has around 270 clear nights in a year and is also one of the emerging sites for infrared and submillimetre optical astronomy.
    • This is because water vapor absorbs electromagnetic signals and reduces their strength.

     

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  • What is Dark Energy?

    Last week, an international team of researchers has made the first direct detection of dark energy.

    About the Project

    • The XENON1T experiment is the world’s most sensitive dark matter experiment and was operated deep underground at the INFN Laboratori Nazionali del Gran Sasso in Italy.
    • The finding also suggests that experiments like XENON1T, which are designed to detect dark matter, could also be used to detect dark energy.

    What is Dark Energy?

    • Dark energy is an unknown form of energy that affects the universe on the largest scales.
    • The first observational evidence for its existence came from measurements of supernovae, which showed that the universe does not expand at a constant rate; rather, the expansion of the universe is accelerating.
    • Prior to these observations, it was thought that all forms of matter and energy in the universe would only cause the expansion to slow down over time.
    • Measurements of the cosmic microwave background suggest the universe began in a hot Big Bang, from which general relativity explains its evolution and the subsequent large-scale motion.
    • Without introducing a new form of energy, there was no way to explain how an accelerating universe could be measured.

    Does it exist?

    • Since the 1990s, dark energy has been the most accepted premise to account for the accelerated expansion.
    • As of 2021, there are active areas of cosmology research aimed at understanding the fundamental nature of dark energy.

    Dark energy Vs Dark matter

    • Everything we see – the planets, moons, massive galaxies, you, me, this website – makes up less than 5% of the universe.
    • About 27% is dark matter and 68% is dark energy.
    • While dark matter attracts and holds galaxies together, dark energy repels and causes the expansion of our universe.

     

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  • Chang’e-5 Lunar Mission

    The Europlanet Society has released details from the samples brought back by China’s Chang’e-5 Lunar Mission in December 2020.

    Chang’e-5 Lunar Mission

    • The Chang’e-5 lunar mission delivered to Earth nearly 2 kg of rocky fragments and dust from the Moon.
    • It had landed on an area of the Moon (the ‘far side’) not sampled by the American or Soviet missions nearly 50 years ago.
    • It thus retrieved fragments of the youngest lunar rocks ever brought back for analysis in laboratories on Earth.
    • The rocks are also different from those returned decades ago.

    Key findings

    • 90% of the materials collected by Chang’e-5 likely derive from the landing site and its immediate surroundings, which are of a type termed ‘mare basalts’.
    • These volcanic rocks are visible to us as the darker grey areas that spilled over much of the nearside of the Moon as ancient eruptions of lava.
    • Yet 10% percent of the fragments have distinctly different, ‘exotic’ chemical compositions.

    What are the exotic compositions?

    • The distinct 10% fragments may preserve records of other parts of the lunar surface as well as hints of the types of space rocks that have impacted the Moon’s surface.
    • Researchers have looked at the potential sources of beads of rapidly cooled glassy material.
    • They have traced these glassy droplets to extinct volcanic vents known as ‘Rima Mairan’ and ‘Rima Sharp’.
    • These fragments could give insights into past episodes of energetic, fountain-like volcanic activity on the Moon.

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  • What is Planet Nine?

    A new study’s “treasure map” suggests that a planet several times more massive than Earth could be hiding in our solar system, camouflaged by the bright strip of stars that make up the Milky Way.

    Do not wonder. This too was a PYQ:

    Q.Which planet was downgraded to dwarf planet status?

    (a) Pluto

    (b) Mars

    (c) Earth

    (d) Venus

     

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    Planet 9

    • Planet Nine is a hypothetical planet in the outer region of the Solar System.
    • Its gravitational effects could explain the unlikely clustering of orbits for a group of extreme trans-Neptunian objects (ETNOs), bodies beyond Neptune that orbit the Sun at distances averaging more than 250 times that of the Earth.
    • Based on earlier considerations, this hypothetical super-Earth-sized planet would have had a predicted mass of five to ten times that of the Earth, and an elongated orbit 400 to 800 times as far from the Sun as the Earth.

    Curiosity for the ninth Planet

    • In August 2006, the International Astronomical Union broke several hearts when it announced that it had reclassified Pluto as a dwarf planet. ‘
    • The decision was based on Pluto’s size and the fact that it resides within a zone of other similarly-sized objects.

    Is everyone convinced that Planet Nine exists?

    • Researchers from across the globe have carried out several studies on Planet Nine and there are several theories about it, including one that stated Planet Nine could in fact be a black hole.
    • Another research has argued that the unknown object causing anomalous orbits of the trans-Neptunian objects could be a primordial black hole.
    • Yet another study noted that a trans-Neptunian object called 2015 BP519 had an unusual trajectory because it was affected by Planet Nine’s strong gravity.

    Back2Basics: Dwarf Planet

    • A dwarf planet is a small planetary-mass object that is in direct orbit of the Sun – something smaller than any of the eight classical planets, but still a world in its own right.
    • As of today, there are officially five dwarf planets in our Solar System.
    • The most famous is Pluto, downgraded from the status of a planet in 2006.
    • The other four, in order of size, are Eris, Makemake, Haumea and Ceres. The sixth claimant for a dwarf planet is Hygiea, which so far has been taken to be an asteroid.
    • These four criteria are – that the body orbits around the Sun, it is not a moon, has not cleared the neighborhood around its orbit, and has enough mass for its gravity to pull it into a roughly spherical shape.

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