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Subject: Science and 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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  • Shale and its potential in India

    Cairn Oil & Gas has announced that it is partnering US-based Halliburton to start shale exploration in the Lower Barmer Hill formation, Western Rajasthan.

    What is Shale oil?

    • Shale oil is an unconventional oil produced from oil shale rock fragments by pyrolysis, hydrogenation, or thermal dissolution.
    • These processes convert the organic matter within the rock (kerogen) into synthetic oil and gas.
    • The refined products can be used for the same purposes as those derived from crude oil.

     How does it differ from conventional crude oil?

    • The key difference between shale oil and conventional crude is that the former, also called ‘tight oil’, is found in smaller batches, and deeper than conventional crude deposits.
    • Its extraction requires creation of fractures in oil and gas rich shale to release hydrocarbons through a process called hydraulic fracking.

    What is fracking?

    • Fracking is the process of drilling down into the earth before a high-pressure water mixture is directed at the rock to release the gas inside.
    • Water, sand and chemicals are injected into the rock at high pressure which allows the gas to flow out to the head of the well.
    • The process can be carried out vertically or, more commonly, by drilling horizontally to the rock layer, which can create new pathways to release gas or used to extend existing channels.
    • The term fracking refers to how the rock is fractured apart by the high-pressure mixture.

    Shale production in the world

    • Russia and the US are among the largest shale oil producers in the world.
    • With a surge in shale oil production in the US, it has played a key role in turning the country from an importer of crude to a net exporter in 2019.

    Shale reserves in India

    • As per the US EIA 2015 report, India has got technically recoverable shale gas of 96 trillion cubic feet.
    • The recoverable reserves are identified in Cambay, Krishna – Godavari, Cauvery, Damodar Valley, Upper Assam, Pranahita – Godavari, Rajasthan and Vindhya Basins.
    • The ONGC has drilled the first exploratory shale gas well in Jambusar near Vadodara, Gujarat, in Cambay basin during October 2013.

    What are the prospects of shale oil exploration in India?

    • Currently, there is no large-scale commercial production of shale oil and gas in India.
    • Shale oil and gas exploration faces several challenges other than environmental concerns around massive water requirements for fracking and potential for ground water contamination.
    • State-owned ONGC had, in 2013, started exploration and, by the end of FY21, assessed shale oil and gas potential in 25 nomination blocks.
    • But it has reduced investments over the past few years after only getting limited success in shale exploration efforts.

     

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  • Creating safe digital spaces

    Context

    Various reports have indicated increased incidence of cyberbullying and online child sexual exploitation by adults.

    Tackling cyberbullying

    • School closures as a response to the COVID-19 lockdowns have led to an unprecedented rise in unsupervised screen time for children and young people, which in turn exposed them to a greater risk of online violence.
    • In India, an estimated 71 million children aged 5-11 years access the Internet on the devices of their family members, constituting about 14% of the country’s active Internet user base of over 500 million
    • There is growing scientific evidence which suggests that cyberbullying has negative consequences on the education, health and well-being of children and young people.
    • Published in 2019 and drawing on data from 144 countries, UNESCO’s report ‘Behind the numbers: Ending school violence and bullying’ highlighted the extent of the problem, with almost one in three students worldwide reporting being bullied at least once in the preceding month.
    • Therefore, cyberbullying prevention interventions should aim at tackling all types of bullying and victimisation experiences at the same time, as opposed to each in silo.

    Cyberbullying prevention interventions

    • Although online violence is not limited to school premises, the education system plays a crucial role in addressing online safety.
    • To prevent and counter cyberbullying, the information booklet brought out by UNESCO in partnership with NCERT on Safe Online Learning in Times of COVID-19 can be a useful reference.
    • Effective interventions also require gender-sensitive and targeted approaches that respond to needs of learners who are most likely to be the victims of online violence.
    • Concerted efforts must be made to provide children and young people with the knowledge and skills to identify online violence so that they can protect themselves from its different forms, whether perpetrated by peers or adults.
    • Teachers also play a critical role by teaching students about online safety, and thus supporting parental involvement.

    Conclusion

    It is imperative that digital and social media platforms are free of cyberbullying, if learners have to access quality education. More importantly, confidential reporting and redress services must be established.

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  • Was it really a black hole that the EHT imaged in 2019?

    A new research says that M87* which was imaged by the Event Horizon Telescope (EHT) is not necessarily a black hole but could even be a naked singularity with a gravitomagnetic monopole.

    About M-87*

    • In 2019, astronomers of the Event Horizon Telescope (EHT) captured the first ever image of a supermassive black hole (M87*) which was located at the centre of a galaxy Messier 87.
    • This black hole was calculated to be 6.5 billion times the Sun’s mass and is 55 million light years away from the Earth.
    • The discovery set the world of astronomy on fire and also found a mention in the “popular information” section of the announcement of the Nobel Prize in physics for 2020.
    • Andrea Ghez and Rheinhard Genzel were awarded half the share of the prize for their study of the black hole at the centre of the Milky Way galaxy, Sagittarius A*.

    A black hole has two parts:

    1. Singularity at its core– a point that is infinitely dense, as all the remnant mass of the star is compressed into this point.
    2. Event horizon – an imaginary surface surrounding the singularity, and the gravity of the object is such that once anything enters this surface, it is trapped forever.
    • Not even light can escape the pull of the singularity once it crosses the event horizon.
    • That is why, we cannot see the singularity at the heart of a black hole but only see points outside the event horizon.
    • Hence, all the physics happening within the black hole’s event horizon is indeed blocked from the view of the observer.

    What is the recent explanation of M87*?

    Ans. Naked Singularity

    • When stars much more massive than the Sun reach the end of their lives, they collapse under their own gravity, and the product of this collapse is a black hole.
    • In many scenarios of stellar collapse, the event horizon does not form, and the singularity is exposed to the outside, without any event horizon shielding it.
    • This is called naked singularity.

    Monopoles and gravity

    • In the nineteenth century, James Clerk Maxwell unified electricity and magnetism as one combined phenomenon, showing that light is an electromagnetic wave.
    • But there is an asymmetry between electricity and magnetism.
    • While positive and negative electric charges can be found to exist independently, the poles of a magnet are always found in pairs, north and south bound together.
    • There is an analogy between gravitational force and electromagnetism to say that mass is like electric charge and can exist independently, thus it can be called a “gravito-electric charge”.

    But then, what is the gravito-magnetic charge?

    • In 1963, Newman, Tamburino and Unti (NUT) proposed a theoretical concept called a “gravito-magnetic charge” also called a gravitomagnetic monopole.
    • The new research has shown that M87* could be a black hole (with or without gravitomagnetic monopole) or a naked singularity (with or without gravitomagnetic monopole).

    Try this PYQ:

    Q. “Event Horizon” is related to:

    (a) Telescope

    (b) Black hole

    (c) Solar glares

    (d) None of the above

     

    [wpdiscuz-feedback id=”gr9bztx2ug” question=”Please leave a feedback on this” opened=”1″]Post your answers here.[/wpdiscuz-feedback]

    Back2Basics: Event Horizon Telescope (EHT)

    • The EHT project is an international partnership formed in 2012.
    • It is a network of 10 radio telescopes on four continents that collectively operate like a single instrument nearly the size of the Earth.
    • Its main objective is to directly observe the immediate environment of a black hole.

     

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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 Leonid’s Meteor Shower?

    The annual Leonid’s Meteor Shower has begun.

    Try this question from CSP 2014:

    Q.What is a coma, in the content 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

     

    [wpdiscuz-feedback id=”8v5gmesm0l” question=”Please leave a feedback on this” opened=”1″]Post your answers here.[/wpdiscuz-feedback]

    What is Leonid Meteor Shower?

    • Meteor showers are named after the constellation they appear to be coming from.
    • The Leonids originate from the constellation Leo the Lion– the groups of stars that form a lion’s mane.
    • They emerge from the comet Tempel-Tuttle, which requires 33 years to revolve once around the Sun.
    • These meteors are bright and among the fastest moving– travelling at speeds of 71 km per second.
    • During this year’s showers, peaks of around 10 to 15 meteors are expected to be seen every hour.
    • The Leonid showers include fireballs– bright and large meteors than can last longer than average meteors, and “earthgazers”– meteors which appear close to the horizon with colourful and long tails.

    What is a meteor shower?

    • On its journey around the Sun, the Earth passes through large swathes of cosmic debris.
    • The debris is essentially the remnants of comets — great frigid chunks of matter that leave behind dirty trails of rocks and ice that linger long after the comets themselves have passed.
    • As the Earth wades through this cloud of comet waste, the bits of debris create what appears from the ground to be a fireworks display in the sky — known as a meteor shower.
    • Several meteor showers can be seen around the year. According to NASA, over 30 meteor showers occur annually and are observable from the Earth.

    Back2Basics:

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  • Iran has enriched over 210 kg of Uranium to 20%

    Iran’s atomic agency has said that its stockpile of 20% enriched uranium has reached over 210 kilograms, the latest defiant move ahead of upcoming nuclear talks with the West.

    What is Uranium Enrichment?

    • It is a process that is necessary to create an effective nuclear fuel out of mined uranium.
    • It involves increasing the percentage of uranium-235 which undergoes fission with thermal neutrons.
    • Nuclear fuel is mined from naturally occurring uranium ore deposits and then isolated through chemical reactions and separation processes.
    • These chemical processes used to separate the uranium from the ore are not to be confused with the physical and chemical processes used to enrich the uranium.

    Why is enrichment carried out?

    • Uranium found in nature consists largely of two isotopes, U-235 and U-238.
    • Natural uranium contains 0.7% of the U-235 isotope.
    • The remaining 99.3% is mostly the U-238 isotope which does not contribute directly to the fission process (though it does so indirectly by the formation of fissile isotopes of plutonium).
    • The production of energy in nuclear reactors is from the ‘fission’ or splitting of the U-235 atoms since it is the main fissile isotope of uranium.
    • Naturally occurring uranium does not have a high enough concentration of Uranium-235 at only about 0.72% with the remainder being Uranium-238.

     

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  • Giant Magellan Telescope (GMT)

    In Chile’s dry Atacama Desert, stargazers are scanning the clear night skies to detect the existence of life on other planets and study so-called ‘dark energy’. Central to the race to peer into distant worlds is the GMT.

    Giant Magellan Telescope (GMT)

    ⦁ The GMT is a ground-based extremely large telescope under construction.
    ⦁ It is US-led in partnership with Australia, Brazil, and South Korea, with Chile as the host country.
    ⦁ It will consist of seven 8.4 m (27.6 ft) diameter primary segments, that will observe optical and near infrared (320–25000 nm) light.
    ⦁ It will have the resolving power of a 24.5 m (80.4 ft) primary mirror and collecting area equivalent to a 22.0 m (72.2 ft) one which is about 368 square meters.
    ⦁ It is expected to have a resolving power 10 times greater than the Hubble Space Telescope.

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    Bakc2Basics: Hubble Space Telescope

    ⦁ The Hubble Space Telescope is a space telescope that was launched into low Earth orbit in 1990 and remains in operation.
    ⦁ It was not the first space telescope, but it is one of the largest and most versatile, renowned both as a vital research tool and as a public relations boon for astronomy.
    ⦁ It is said to be the “most significant advance in astronomy since Galileo’s telescope.
    ⦁ It captures images of deep space playing a major role in helping astronomers understand the universe by observing the most distant stars, galaxies and planets.

  • Katol L6 Chondrite Meteorite

    Last month, researchers from the Geological Survey of India collected some meteorite fragments near the town of Katol in Nagpur in 2012. Studying this, IIT Kgp researchers have unravelled the composition expected to be present in the Earth’s lower mantle which is at about 660 km deep.

    Katol L6

    • 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.

    Key findings: Presence of Bridgmanite

    • The study reported for the first time, presence of veins of the mineral bridgmanite, which is the most abundant mineral in the interior of the Earth, within the Katol L6 Chondrite meteorite.
    • Bridgmanite consists of magnesium, iron, calcium aluminium oxide and has a perovskite structure. It is the most volumetrically abundant mineral of the Earth’s interior.
    • It is present in the lower mantle (from 660 to 2700 km), and it is important to understand its formation mechanism to better comprehend the origin and evolution of planetary interiors.

    What is the hypothesis of moon-formation?

    The discovery of Bridgmanite in Katol L6 adds evidence to the Moon-forming giant impact hypothesis.

    • The Moon-forming giant impact hypothesis occurred nearly 4.5 billion years ago.
    • The Earth collided with a planet the size of Mars named Thela.
    • The force of this impact was so huge as to melt the Earth down from the surface to a depth of 750 km to 1,100 km.
    • The hypothesis goes that this caused the Earth to be bathed in a magma ocean, and the ejecta from the collision led to the formation of the Moon.

    Note: Earth was an ocean of magma in the past.  The heavier iron and nickel went to the core while the lighter silicates stayed in the mantle.

    Future prospect of the study

    • This finding could help investigations of high-pressure phase transformation mechanisms in the deep Earth.

    Back2Basics: Interior of Earth

    Earths Structure

    ​​The earth is made up of three different layers: the crust, the mantle and the core.

    The crust

    This is the outside layer of the earth and is made of solid rock, mostly basalt and granite. There are two types of crust; oceanic and continental. Oceanic crust is denser and thinner and mainly com​posed of basalt.  Continental crust is less dense, thicker, and mainly composed of granite.

    The mantle

    The mantle lies below the crust and is up to 2900 km thick.  It consists of hot, dense, iron and magnesium-rich solid rock. The crust and the upper part of the mantle make up the lithosphere, which is broken into plates, both large and small.

    The core

    The core is the centre of the earth and is made up of two parts: the liquid outer core and solid inner core. The outer core is made of nickel, iron and molten rock. Temperatures here can reach up to 50,000 C.

     

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  • Nationwide Pneumococcal Conjugate Vaccine (PCV) drive launched

    Union Health Minister has launched a nationwide expansion of Pneumococcal 13-valent Conjugate Vaccine (PCV) under the Universal Immunisation Programme (UIP).

    Why such drive?

    • Pneumonia was a leading cause of death among children under five, globally and in India.
    • Pneumonia caused by pneumococcus is the most common cause of severe pneumonia in children.
    • Around 16% of deaths in children occur due to pneumonia in India.
    • The nationwide roll-out of PCV will reduce child mortality by around 60%.

    Pneumococcal Conjugate Vaccine (PCV)

    • The PCV is a mix of several bacteria of the pneumococci family, which are known to cause pneumonia—hence ‘conjugate’ is included in the name of the vaccine.
    • PCV prevents pneumococcal disease. It can protect both children and adults from pneumococcal disease.
    • Such conjugate vaccines are made using a combination of two different components.

    Pneumonia vs Pneumococcal pneumonia

    • Pneumonia is a lung disease.
    • Pneumococcal pneumonia, a kind of pneumonia, can infect the upper respiratory tract and can spread to the blood, lungs, middle ear, or nervous system.
    • Pneumococcal disease is a name for any infection caused by bacteria called Streptococcus pneumonia or pneumococcus.
    • Most people carry pneumococcus in their nose and throat, where the bacteria do not cause any symptoms.

    Take this yorker from CSP 2020:

    Q.What is the importance of using Pneumococcal Conjugate Vaccines in India?

    1. These vaccines are effective against pneumonia as well as meningitis and sepsis.
    2. Dependence on antibiotics that are not effective against drug-resistant bacteria can be reduced.
    3. These vaccines have no side effects and cause no allergic reactions.

    Select the correct answer using the code given below:

    (a) 1 only

    (b) 1 and 2 only

    (c) 3 only

    (d) 1, 2 and 3

     

    [wpdiscuz-feedback id=”txjic5odbw” question=”Please leave a feedback on this” opened=”1″]Post your answers here.[/wpdiscuz-feedback]

     

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