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GS Paper: GS3

  • Panel on AFSPA removal misses ‘45-day’ deadline

    A committee constituted by the Union Home Ministry to study the withdrawal of the Armed Forces (Special Powers) Act, or AFSPA, from Nagaland, slated to submit a report within 45 days is yet to conclude its findings.

    AFSPA: A Backgrounder

    • The AFSPA, 1958 came into force in the context of insurgency in the North-eastern States decades ago.
    • It provides “special power” to the Armed Forces applies to the Army, the Air Force and the Central Paramilitary forces etc.
    • It has been long contested debate whether the “special powers” granted under AFSPA gives total immunity to the armed forces for any action taken by them.

    Armed Forces (Special Powers) Act, 1958

    • Armed Forces Special Powers Act, to put it simply, gives armed forces the power to maintain public order in “disturbed areas.”
    • AFSPA gives armed forces the authority use force or even open fire after giving due warning if they feel a person is in contravention of the law.
    • The Act further provides that if “reasonable suspicion exists”, the armed forces can also arrest a person without warrant; enter or search premises without a warrant; and ban the possession of firearms.

    What are the Special Powers?

    The ‘special powers’ which are spelt out under Section 4 provide that:

    (a) Power to use force, including opening fire, even to the extent of causing death if prohibitory orders banning assembly of five or more persons or carrying arms and weapons, etc are in force in the disturbed area;

    (b) Power to destroy structures used as hide-outs, training camps, or as a place from which attacks are or likely to be launched, etc;

    (c) Power to arrest without warrant and to use force for the purpose;

    (d) Power to enter and search premises without a warrant to make arrest or recovery of hostages, arms and ammunition and stolen property etc.

    What are the Disturbed Areas?

    • A disturbed area is one that is declared by notification under Section 3 of the AFSPA.
    • As per Section 3, it can be invoked in places where “the use of armed forces in aid of the civil power is necessary”.

    Who can declare/notify such areas?

    • The Central Government or the Governor of the State or administrator of the Union Territory can declare the whole or part of the State or Union Territory as a disturbed area.
    • A suitable notification would have to be made in the Official Gazette.

    Presently ‘Disturbed Areas’

    • AFSPA is currently in force in Assam, Nagaland, Manipur, 3 districts of Arunachal Pradesh, and areas falling within the jurisdiction of 8 police stations in Arunachal Pradesh bordering Assam.
    • In Jammu and Kashmir, a separate law Armed Forces (Jammu and Kashmir) Special Powers Act, 1990 has been in force.

     Is it a License to Kill?

    While the operation of the Section has been controversial in itself, it has attracted much criticism when actions have resulted in the death of civilians.

    • Power to kill: Section 4 of the Act granted officers the authority to “take any action” even to the extent to cause the death.
    • Protection against prosecution: This power is further bolstered by Section 6 which provides that legal can be instituted against the officer, except with the previous sanction of the Central Government.

    Supreme Court’s Observations over AFSPA

    • These extra-judicial killings became the attention of the Supreme Court in 2016.
    • It clarified that the bar under Section 6 would not grant “total immunity” to the officers against any probe into their alleged excesses.
    • The judgment noted that if any death was unjustified, there is no blanket immunity available to the perpetrator(s) of the offense.
    • The Court further noted that if an offense is committed even by Army personnel, there is no concept of absolute immunity from trial by the criminal court constituted under the CrPC.

    Constitutionality of AFSPA

    • Attempts have been made to examine the constitutionality of the Act on the grounds that it is contravention to the:
    1. Right to Life and Personal Liberty (Article 21) and
    2. Federal structure of the Constitution since law and order is a State subject

    Recommendations to repeal AFSPA

    (1) Justice B.P. Jeevan Reddy Commission

    • The 2004 Committee headed by Justice B.P. Jeevan Reddy, the content of which has never officially been revealed by the Government, recommended that AFSPA be repealed.
    • Additionally, it recommended that appropriate provisions be inserted in the Unlawful Activities Prevention Act, 1967 (UAPA) instead.
    • It also recommended that the UAPA be modified to clearly specify the powers of the armed forces and paramilitary forces and grievance cells should be set up in each district where the armed forces are deployed.

    (2) ARC II

    • The Administrative Reforms Commission in its 5th Report on ‘Public Order’ had also recommended that AFSPA be repealed.
    • It recommended adding a new chapter to be added to the Unlawful Activities Prevention Act, 1967.
    • However, the recommendation was considered first and then rejected.

    Controversies with AFSPA

    (1) Sexual Misconduct by Armed Forces

    • The issue of violation of human rights by actions of armed forces came under the consideration of the Committee on Amendments to Criminal Law (popularly known as Justice Verma Committee) set up in 2012.
    • It observed that- in conflict zones, legal protection for women was neglected.

    (2) Autocracy

    • The reality is that there is no evidence of any action being taken against any officer of the armed forces or paramilitary forces for their excesses.

    Caution given by the Supreme Court

    A July 2016 judgment authored by Justice Madan B. Lokur in Extra Judicial Execution Victim Families Association quoted the “Ten Commandments” issued by the Chief of the Army Staff for operations in disturbed areas:

    1. Definite circumstances: The “power to cause death is relatable to maintenance of public order in a disturbed area and is to be exercised under definite circumstances”.
    2. Declaration preconditions: These preconditions include a declaration by a high-level authority that an area is “disturbed”.
    3. Due warning: The officer concerned decides to use deadly force on the opinion that it is “necessary” to maintain public order. But he has to give “due warning” first.
    4. No arbitrary action: The persons against whom the action was taken by the armed forces should have been “acting in contravention of any law or order for the time being in force in the disturbed area”.
    5. Minimal use of force: The armed forces must use only the “minimal force required for effective action against the person/persons acting in contravention of the prohibitory order.”
    6. Empathy with perpetrators: The court said that: the people you are dealing with are your own countrymen. All your conduct must be dictated by this one significant consideration.
    7. People friendliness: The court underscored how the Commandments insist that “operations must be people-friendly, using minimum force and avoiding collateral damage – restrain must be the key”.
    8. Good intelligence: It added that “good intelligence is the key to success”.
    9. Compassion: It exhorted personnel to “be compassionate, help the people and win their hearts and minds. Employ all resources under your command to improve their living conditions”.
    10. Upholding Dharma (Duty): The judgment ended with the final Commandment to “uphold Dharma and take pride in your country and the Army”.

    Conclusion

    • Despite demands by civil society groups and human rights activities, none of the recommendations have not been implemented to date.

     

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  • What are Swiss Banks?

    A whistleblower has leaked information on more than $100 billion held in 30,000 accounts of Zurich-headquartered Credit Suisse, one of the world’s most infamous banks which hold black money.

    What is the news?

    • The investigation refocused attention on Swiss banks and their famous, century-old culture of secrecy.
    • This swiss tradition is under pressure as countries around the world try to get their super-rich to pay legitimate taxes on their wealth.

    Swiss Banks: Defined by Secrecy

    • Since at least the beginning of the 18th century, Geneva had become a favoured destination of French royalty and other European elites seeking discreet havens to stash their wealth.
    • In 1713, Swiss government authorities announced laws prohibiting bankers from giving out information about their customers.
    • Thus began a powerful culture of silence and secrecy that went on to become the defining feature of Swiss banking.
    • In 1934, Switzerland passed the Federal Act on Banks and Savings Banks, commonly known as the Banking Law of 1934 or the Swiss Banking Act.

    What’s behind this upmost secrecy?

    • Article 47 made it a crime to reveal details or information of customers to almost anyone — including the government — without their consent and in the absence of a criminal complaint.
    • Violators can get five years in prison; Article 47 lies at the heart of some of the most stringent banking secrecy laws anywhere.

    Why are they favourite destination to park black money?

    • As wealth became easily mobile across international borders, the safety and stability of Swiss banks, located in a peaceful country presented an irresistible attraction for the super-rich.
    • Switzerland itself is a politically neutral country.
    • Swiss bank accounts are attractive to depositors because they combine low levels of risk with very high levels of privacy.
    • The Swiss economy is extremely stable, and the banks are run at very high levels of professionalism.
    • Almost any adult in the world can open an account in a Swiss bank. Opening an account is not difficult, and requires not much more than basic KYC, including a proof of identity such as a passport.

    Question of ‘black money’

    • “Black money” allegedly stashed away by Indians in Swiss banks is a political issue in India, and parties and political functionaries have often made promises to “bring it back”.
    • Swiss authorities have maintained that they cooperate with the Indian government to fight tax evasion and fraud.

    Indian motives and moves

    • The two countries have had a system of automatic exchange of information in tax matters since 2018.
    • Under this, detailed financial information on all Indian residents with accounts in Swiss financial institutions was provided for the first time to Indian authorities in September 2019.

     

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  • Who are the Angadias?

    An FIR has been registered against some Mumbai Police officials last week for allegedly threatening Angadias and extorting money from them in south Mumbai.

    Who are Angadias?

    • The Angadia system is a century-old parallel banking system in the country where traders send cash generally from one state to another through a person called Angadia that stands for courier.
    • It is by and large used in the jewellery business with Mumbai – Surat being the most popular route as they are two ends of the diamond trade.
    • The cash involved is huge and it is the responsibility of the Angadia to transfer cash from one state to another for which they charge a nominal fee.
    • Generally, it is the Gujarati, Marwari and Malbari community that are involved in the business.

    How does the system work?

    • The Angadia system works completely on trust as large sums, at times in crores, are involved.
    • Generally, traders have the same Angadias for decades together.
    • If a trader from Zaveri Bazaar in south Mumbai wants to pay a diamond trader in Surat, he will send an Angadias who usually delivers the money within 24 hours.
    • They also have fixed trains that leave from Mumbai at night and reach Gujarat by early morning.
    • Usually, to verify authenticity, the trader will, for example, will give a Rs 10 note to the Angadia and provide the number of the note to the recipient.
    • It is only after the recipient confirms the note number that the Angadia will hand over the money to the person.
    • After making the payment, the Angadias return to Mumbai the same day.

    Is the system legal?

    • While the Angadia system per se is legal, there hangs a cloud over the activity as it is suspected that a lot of times it is used to transfer unaccounted money.
    • Since the business deals in cash and there is no account maintained for the same, there have been suspicions that it is also used for transfer of black money like the hawala.

     

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  • Issues with corporate governance in the context of NSE scam

    Context

    Over the past 10 days, the revelations about the functioning of the National Stock Exchange (NSE) during the tenure of Chitra Ramkrishna as Managing Director and Chief Executive Officer (CEO) have raised questions about the governance.

    Managerial misconduct at NSE

    •  There was managerial misconduct at NSE.
    • An effective board of directors: That is why we need checks on management such as an effective board of directors.
    • After the board was informed about the irregularities in Mr. Subramanian’s appointment, it discussed the matter but chose to keep the discussions out of the minutes on grounds of confidentiality and the sensitivity of the matter.
    • Second, despite being aware of Ms. Ramkrishna’s transgressions, it allowed her to resign and on generous terms instead of taking action against her.
    • Third, the Public Interest Directors (PIDs) failed to keep SEBI informed about the goings-on at the NSE.

    Issues with corporate governance

    • In the corporate world, much is forgiven on grounds of performance.
    • When a performing CEO chooses to unduly favour a particular individual or individuals, boards see that as a forgivable infirmity.
    • As for dysfunctional or ineffective boards, these remain the norm despite numerous regulations, seminars and papers over the past four decades.
    • In case of the the NSE, the problem is structural.
    • Selection and absence of penalty: It has to do partly with the way board members are selected and partly with the absence of penalties where directors do not live up to their mandate.
    • Board members are selected by top management (or, in India, by the promoter who is also top management).
    • Board members have every incentive to nod their heads to whatever the management wants to be done.

    Way forward

    • 1] Diversity in the selection of board members: As long as the top management selects all board members or can influence their selection, there is little hope of any active challenge to management.
    • The top management must be allowed to choose not more than 50% of the independent directors.
    • The rest must be chosen by various other stakeholders — financial institutions, banks, small shareholders, employees, etc.
    • 2] Accountability of board members: A second thing that needs to happen is holding board members accountable for lapses.
    • Regulators act against directors where there is financial malfeasance.
    •  This must change. Regulators must penalise errant directors through a whole range of instruments — strictures, financial penalties, removal from boards and a permanent ban from board membership.
    • 3] Accountability of regulator: Regulators themselves must be held to account.
    • In the NSE affair, questions have been asked of SEBI.
    •  For instance, why did SEBI not seek the help of the cyber police to ascertain the identity of the yogi?
    • SEBI needs to explain itself.

    Conclusion

    Convulsions of outrage after particular episodes will not take us very far. We need significant institutional reform if corporate governance is not to remain an illusion.

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  • All you need to know about Satellite Internet

    The Reliance has launched a joint venture (JV) with European satellite-based broadband service company SES to enter the satellite internet space.

    What is Satellite Internet?

    • The technology beams the internet down from a satellite that’s orbiting the Earth.
    • Jio, Bharti Airtel Ltd’s OneWeb, and billionaire Elon Musk’s Starlink want to send thousands of these satellites to orbit.
    • OneWeb plans to launch 648 satellites, while Musk’s Starlink has permits to launch over 4,000 of them.
    • So far, OneWeb has launched over 400 satellites, while Starlink has launched over 2,000 satellites.
    • It’s worth noting that Starlink plans to launch 42,000 satellites in the coming decade. Jio’s journey has only just begun.

    Which satellites will Indian JV use?

    • The JV will use geostationary (GEO) and medium earth orbit (MEO) satellites, while Starlink and OneWeb use low earth orbit (LEO) satellites.
    • LEO satellites are cheaper to make and deploy, but require a satellite constellation working in sync to offer coverage on earth.
    • On the other hand, GEO and MEO satellites are larger, deployed in higher orbits, and therefore cost more.
    • These satellites cover a larger area and require fewer ground stations, which makes them ideal for targeted coverage area.
    • LEOs move faster and can hence provide global coverage.

    What are the advantages of satellite internet?

    • The reason telecom firms want to explore satellite internet is because there are areas where fibre connections just can’t reach.
    • Satellite networks are used to bring connectivity in such areas, which include hills and remote islands.
    • Consumer applications are new, but satellite networks have been used for ages in military applications.

    Are there any disadvantages?

    • The applications and the power of satellite internet are often exaggerated.
    • In reality, these networks have limitations, the biggest being high latency and low bandwidths.
    • Latency is all about internet speed, while bandwidth determines how many devices can connect on a network at the same time.
    • Experts say current satellite connections will bring 1-2 MB bandwidth, which just about qualifies as broadband under India’s broadband policy.
    • Trouble-shooting can be a problem because it needs specialized knowledge.

    Who can use satellite internet?

    • Militaries across the world have depended on satellite communications for a long time.
    • However, many military experts, too, consider this form to be unreliable and too expensive to be made the sole communication medium.
    • In remote areas, satellite internet can still allow businesses to open up local branches and provide digital services.
    • In theory, a bank could set up more ATMs in remote regions if it has access to satellite internet.

     

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  • EV Battery Swapping Policy

    NITI Aayog is holding a consultation on the upcoming electric vehicle (EV) battery swapping policy.

    What is BaaS?

    • Battery-as-a-service (BaaS) is seen as a viable charging alternative.
    • Manufacturers can sell EVs in two forms: Vehicles with fixed or removable batteries and vehicles with batteries on lease.
    • If you buy an electric scooter with battery leasing, you do not pay for the cost of the battery—that makes the initial acquisition almost 40% cheaper.
    • Users can swap drained batteries for a fully charged one at a swap station. The depleted batteries are then charged on or off-site.
    • The advantages of swapping include low downtimes for commercial fleets, reduced space requirements, and lower upfront costs.
    • It is also a viable solution for those who don’t have parking spots at home.

    What is battery interoperability?

    • That’s when a battery is compatible across vehicles and chargers, so you can seamlessly swap a battery at any swap station. This can help achieve scale.
    • However, manufacturer and service providers say there are safety concerns around the ‘one-size-fits-all’ model and caution too much standardization can kill innovation.

    Why hasn’t BaaS taken off yet?

    • There are economic and operational constraints.
    • Energy service providers offering swapping solutions have to charge 18% goods and services tax (GST) for swapping, compared to 5% GST on the purchase of an EV.
    • Additionally, the government’s FAME-II incentives are not offered to vehicles sold with BaaS or swap station operators.
    • While these are economic disadvantages compared to direct charging solutions, the lack of a dense and interoperable battery swap infrastructure has also hindered the roll-out.
    • Manufacturers, on the other hand, are keen to create proprietary battery and charging systems.

    Issues with BaaS

    • There is a need for standardization of safety specifications  as well as  the battery.
    • Swapping in the various permutations and combinations of batteries at a station  where  they  have not been tested for compatibility could lead to safety hazards.
    • Also, mandating only one type of battery to  be eligible for  concessions  would be  disadvantageous  to  many  players.

    Who offers BaaS in India?

    • Bengaluru-based startup Bounce is the first e-two-wheeler maker to sell its scooters with BaaS, and claims to have achieved a million battery swaps.
    • Others like Ola Electric and Ather have stuck to direct charging solutions, while Hero Electric offers both fixed and removable batteries.
    • Many makers are working with energy service providers to offer battery swapping.
    • The global precedent is a mixed bag: Ample, which offers swaps in the US, has found success with commercial fleets, while most personal users charge at home.

    Why is Battery Swapping needed?

    • High Cost of EVs: An EV, by industry standards, is 1.5-2x costlier than IC Engine counterpart and at least half the cost is from the battery pack.
    • Cost reduction: Many manufacturers are offering batteries separately from a vehicle, reducing the cost. In that case, a fleet owner can buy vehicles without battery and utilize battery swapping.
    • Range Anxiety: Another major reason stopping people from buying EVs is range anxiety, or in simple terms, the fear of battery getting empty without finding a charging station.
    • Inadequate charging infrastructure: Unlike petrol pumps, EV charging stations are rare to spot and that further increases the range anxiety exponentially, especially while going on a road trip.
    • Hazard management: In case of a Swapping Station, one can simply locate a station, go and replace the empty battery with a new one.

     

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  • What is Presidential Fleet Review?

    The President of India recently took part in the Indian Navy’s 12th Presidential Fleet Review.

    What is the President’s Fleet Review?

    • In simplest terms, it is the country’s President taking stock of the Navy’s capability.
    • It showcases all types of ships and capabilities the Navy has.
    • It takes place once under every President, who is the supreme commander of the armed forces.
    • The President is taken on one of the Naval ships, which is called the President’s Yacht, to look at all the ships docked on one of the Naval ports.
    • The yacht will be distinguished by the Ashoka Emblem on her side and will fly the President’s Standard on the Mast”.

    Importance of Presidential Fleet Review

    • A fleet review is usually conducted once during the tenure of the President.
    • So far, 11 Presidential Fleet Reviews have been conducted since Independence, of which two have been International Fleet Reviews, in 2001 and 2016.
    • In terms of significance, the Navy’s Presidential review is second only to the Republic Day Parade.
    • The President will be given a 21-gun salute before embarking on the yacht.

    Do all naval ships participate?

    • The idea is to showcase not all the Navy’s ships, but every type of ship — and the kind of capabilities it has at that time.
    • The review also includes merchant ships as well.

    What else happens in the fleet review?

    • In this most formal of naval ceremonials, each ship dressed in full regalia will salute the President as he passes.
    • The President will also be reviewing the Indian Naval Air Arm in a display of spectacular fly-past by several helicopters and fixed-wing aircraft.
    • In the final stage of the review, a mobile column of warships and submarines will steam past the Presidential Yacht.

    How many of these reviews have been held?

    • There have been 11 President’s Fleet Reviews since Independence.
    • The first was conducted in 1953, under Dr Rajendra Prasad.
    • The next one was done not by the President but by the then Defence Minister, Y B Chavan, in 1964.
    • Since then, it has been the President reviewing the fleet.
    • The longest gap between reviews was of 12 years — between 1989 (President R Venkatraman) and when 2001 (President K R Narayanan).
    • The last one was done in 2016, under President Pranab Mukherjee.

    Significance of the event

    • It is one of the most important events for the Navy, which is essentially showing its allegiance and commitment to defending the country.
    • It is a long-standing tradition followed by navies across the world, and according to Navy officials it is a strong bond that links seafarers of the world.
    • Historically, a Fleet Review is an assembly of ships at a pre-designated place for the purpose of displaying loyalty and allegiance to the Sovereign and the state.
    • In turn, the Sovereign, by reviewing the ships, reaffirms his faith in the fleet and its ability to defend the nation’s maritime interest.
    • It is perhaps conceived as a show of naval might. Though it still has the same connotation, assembling of warships without any belligerent intentions is now the norm in modern times.

     

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  • How uniform power cost and electricity duty can achieve higher growth

    Context

    Electricity prices vary not just among end users, but also between states, where a complex patchwork of different taxes and subsidy regimes can leave consumers in some states paying five times more for their electricity than their counterparts in neighbouring states.

    Deprivations faced by Low Income States in India

    • The low-income States (LIS) are deprived on many fronts.
    • They have low accessibility to credit, low investments, low power availability and accessibility, and high energy costs.
    • The high-income States (HIS), on the other hand, have a big share in industry and commerce because they are not deprived on the same fronts.
    • The six HIS (Maharashtra, Tamil Nadu, Gujarat, Karnataka, Andhra Pradesh and Telangana) together account for 56.4% of factories and 54.3% of the net value added to the country, while their share in population is only 32.3%.
    • Among other reasons, this is because they have higher credit and financial accessibility (55% of total institutional credit and 56% of total industrial credit went to these five HIS) at the credit-deposit ratio.
    • On the other hand, the six LIS (Bihar, Jharkhand, U.P., M.P., Odisha, and Rajasthan) access only 15% of total institutional credit and barely 5% of total industrial credit, while their share in population is 43%.
    • The maximum benefit of the Atmanirbhar package (₹20 lakh crore) also went to the HIS as they have a higher share in industry.

    Role of power supply in disparity among states

    • Among other reasons, the availability of adequate quality power at the cheapest rate attracts investments, either private or public, in a particular location.
    • Due to a complex patchwork of different taxes and subsidy regimes, electricity prices vary not just among end users, but also between states.
    • This can leave consumers in some states paying five times more for their electricity than their counterparts in neighbouring states.

    Solutions

    •  Energy India Outlook 2021 provides two solutions.

    1] Eliminate price discrimination by synchronising all regional grids

    • The power-producing States have the advantage of power,  being available at lower prices.
    • This problem can be addressed by synchronising all the regional grids.
    •  This will help the transfer of energy (without compromising quality).
    • The idea is of ‘One Nation, One Grid, One Frequency’.
    • Further, this will pave the way for establishing a vibrant electricity market and facilitate the trading of power across regions through the adoption of the ‘one tariff’ policy.
    • The Central Electricity Regulatory Commission is in the process of implementing a framework of the Market-Based Economic Dispatch and moving towards ‘One Nation, One Grid, One Frequency, One Price’.

    2] Include electricity duty in GST

    • Apart from uniform cost, the power sector also needs uniformity in electricity duty charged by different States.
    • In general, the association between income and electricity consumption is direct.
    • Thus, only 32% of the population used 50% of power.
    • Contrary to this, six backward States got only 25% of the power though their share of the population is 43%.
    • Therefore, it is clear that the substantial proportion of the power cost incurred in HIS is also borne by the LIS which buy those industrial products, as the input cost of power has already been included in the product’s price.
    •  Further, this situation justifies the fact that the final costs of power consumption are also borne by other States.
    • Thus, the electricity duty should be redistributed among the States under the ambit of GST equally shared by the CGST and SGST.

    Conclusion

    In order to attain higher economic growth, the States should raise the issue of uniform energy tariff and inclusion of electricity duty under the ambit of GST.

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  • Can dark matter be composed, even partly, of black holes?

    A recent hypothesis says that dark matter comprises a large number of compact objects such as primordial black holes.

    What are Dark Matters ?

    • Astronomical observations suggest that a significant part of the universe is made up of dark matter which interacts with the rest of the universe only through the gravitational pull.
    • Many large lab experiments have tried to detect elementary particles that could be candidates for dark matter.
    • However, such dark matter particles have not been detected until now.
    • Several astronomical observations suggest that all galaxies are embedded in a “halo” of dark matter.
    • The “visible” galaxy is like a disc embedded in a dark matter halo that is much larger in size.

    What is the recent proposition?

    • When the universe was very young, hot and dense – soon after the Big Bang, it must have had quantum fluctuations of its density.
    • This, in turn, would have caused some regions to become extremely dense, and therefore, to collapse under their own gravity to form the primordial black holes.
    • While we have no conclusive evidence of spotting these objects, some of the binary black hole mergers detected by the LIGO gravitational wave detectors might be primordial black holes.
    • The question is open there is good reason to believe that primordial black holes did form in the young universe.

    Observing dark matter: Gravitational Lensing

    • The paper explores what happens when such objects get in the way of gravitational waves traveling towards the Earth from the distance.
    • It invokes a phenomenon called gravitational lensing that is used regularly in astronomy.
    • When light travels through space and passes near a massive or compact body – a star, a galaxy or a black hole, for example, the intense gravity of that body may attract the light towards it.
    • This causes bending it from its rectilinear (straight line) path.
    • This phenomenon is known as gravitational lensing and was first observed by Arthur Eddington in 1919.

    How intense are they?

    • Massive objects like galaxies can bend light significantly, producing multiple images, this is called strong lensing.
    • Lighter objects like stars or black holes bend light less, and this is called micro-lensing.
    • A similar lensing can happen to gravitational waves travelling towards the Earth, and this would leave signatures in the detected gravitational waves.
    • This can be used to detect the presence, or the existence, of primordial black holes.

    Assessing dark matter

    • Until now, individual black holes have not marked out these signatures on gravitational waves detected by the LIGO-VIRGO detectors.
    • However, if all of the dark matter is made of primordial black holes, they should have produced detectable signatures on the gravitational wave signals.
    • The researchers use the non-observation of the lensing signatures to assess what fraction of the dark matter could be made of black holes.

    Way ahead

    • This provides a new way of constraining the nature of dark matter.
    • The study concludes that black holes in the mass range from a hundred to a million solar masses can contribute only up to 50-80% of the dark matter in the universe.
    • This is an upper limit and the actual fraction can be much smaller.
    • These upper limits will get better and better with more and more observations.

     

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  • Lucy Mission to probe Jupiter’s Trojan Asteroids

    NASA is set to send its first spacecraft to study Jupiter’s Trojan asteroids to glean new insights into the solar system’s formation 4.5 billion years ago.

    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 km 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 astrophotographer 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 particular behavior 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 fossils in history.
    • Nearly 40 percent of the fossilized 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.

    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.

     

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