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Type: Prelims Only

  • What are Globular Clusters?

    cluster

    Astronomers and scientists at the Indian Institute of Astrophysics (IIA) while studying the Omega Centauri have found that hot stars and white dwarfs emitted less ultraviolet radiation than expected.

    Omega Centauri

    • It is the most massive globular cluster system in our galaxy.
    • It was first identified as a non-stellar object by Edmond Halley in 1677 and as globular star cluster orbiting Milky Way galaxy by John Herschel in 1830s.
    • It contains approximately 10 million stars and is about 16,000 light-years away.
    • It also includes stars of a variety of ages, whereas other globular clusters contain stars from only one generation.
    • It is the largest and brightest globular cluster in the Milky Way.

     What is a globular cluster?

    • A globular cluster is a spheroidal conglomeration of stars.
    • Globular clusters are bound together by gravity, with a higher concentration of stars towards their centres.
    • They can contain anywhere from tens of thousands to many millions of member stars.
    • They orbit mostly in the extended stellar halos surrounding most spiral galaxies.

    How are they formed?

    • No one knows precisely how globular clusters formed. Or what role, if any, they played in the development of galaxies.
    • We know globular clusters are the oldest, largest and most massive type of star cluster. And globular clusters contain the oldest stars.
    • Their age is determined by their almost complete lack of what astronomers call metals, the heavier elements forged in star interiors.

    Our Milky Way has over 150 globular clusters

    • Our own Milky Way has over 150 globular clusters, with perhaps more, hidden by galactic dust.
    • The Andromeda galaxy (M31), our neighboring spiral galaxy, appears to have around 300 globular clusters.

    Difference between a globular cluster and an open cluster

    • Globular clusters are big, symmetric and old. They can reach 300 light-years in diameter and contain 10 million stars.  On the other hand, open star clusters, contains sibling stars, scattered through the disk of our galaxy and presumably other galaxies.
    • Globular star cluster are very symmetrical in shape, and are densest toward their centers. Open star clusters are irregular in shape and loosely grouped together.
    • Globular clusters orbit in the halo of our galaxy. Plus, center around the galaxy’s core and expanding above and below the galactic disk. Open star clusters tend to orbit within the disk.
    • Globular star clusters contain million of stars. Yet some globular clusters, like Omega Centauri, contain millions of stars. Open star clusters contain only hundreds of stars.

     

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  • In news: Ahilyabai Holkar (1725 –1795)

    ahilya

    There has been a proposal from the district administration to rename the Western Maharashtra city of Ahmednagar as ‘Punyashlok Ahilyadevi Nagar’, after the 18th century Malwa queen, Ahilyabai Holkar.

    History of Ahmednagar

    • Ahmednagar lies in the Western region of Maharashtra.
    • It has been a part of some prominent kingdoms, starting from 240 B.C. when the vicinity is mentioned in the reference to the Mauryan Emperor Ashok.
    • The Rashtrakuta Dynasty, the Western Chalukyas, and then the Delhi Sultanate ruled over the region in the Medieval period.
    • In the last case, the rule was not direct, and a revolt by Afghan soldier Alladin Hasan Gangu led to the establishment of the Bahmani kingdom in the Deccan.
    • After some time, Ahmednagar (then known as Nizamshahi) became one of the five independent kingdoms to emerge from that empire.

    How did the city of Ahmednagar first get its name?

    • In 1486, Malik Ahmad Nizam Shah became the Bahmani Sultanate’s Prime Minister.
    • He fought back an attempt by the king to dislodge him from power, and defeated the army of the Bahamani kingdom near Ahmednagar in May 1490.
    • Finally, in 1494 he laid the foundation of a city close to where he defeated the army, on the left bank of Sina river, and named it after himself: Ahmednagar.

    Who was Ahilyabai Holkar?

    • Born in Chondi village of Ahmednagar to the village head Mankoji Shinde, on May 31, 1725, Ahilyabai was one of the few women rulers of Medieval India.
    • While the education of girls and women was rare at that time, Mankoji insisted on it for his daughter.
    • When she was eight years old, Malhar Rao Holkar, the army commander to Peshwa Bajirao, is believed to have spotted her at a temple service in Chondi.
    • Impressed by her devotion and character, he decided to get his son, Khande Rao, married to her.
    • Ahilyabai took control of Malwa after her husband’s death in the Battle of Kumbher against the king of Bharatpur in 1754.

    Her Administration

    • She brought about two important changes in the administration, both divergences from the traditions of her era.
    • She vested the military power in Tukoji Holkar, a confidante of her father-in-law though not related.
    • She separated the state’s revenue from the personal use of the ruling family. Her personal expenses were met from inherited wealth and the land holdings she had.

    Role in demolished temple re-construction

    • From Gangotri to Rameshwaram, and from Dwarka to Gaya, she spent money on rebuilding temples destroyed under the Mughal rule.
    • The most significant one, however, is the current Kashi Vishwanath Temple in Varanasi.
    • Destroyed by the Mughal ruler Aurangzeb to build the Gyaanvapi mosque, the temple was restored in its current form by Ahilyabai in the year 1780, 111 years after its destruction.
    • The Somnath temple, witness to the regular destruction by a host of aggressors over the centuries, was restored in 1783 by all the Maratha confederates, with a significant contributions from Ahilyabai.
    • With temples and rest areas in Kedarnath, Srisailam, Omkareshwar and Ujjain, Ahilyabai contributed to the improvement of facilities at other holy sites hosting Jyotirlingas too.

    Conclusion

    • Ahilyabai died in the year 1795 at the age of 70.
    • Her legacy is not documented in a structured way in history textbooks or popular references either.
    • Part of the problem is the general absence of any non-Mughal, non-British narratives in contemporary Indian history books.

     

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  • Vibrant Village Programme (VVP)

    village

    Union Home Minister said that borders can be permanently secured only when border villages are populated by patriotic citizens who are concerned for the country, asking the border-guarding forces to use the Vibrant Village Programme (VVP) for the same.

    Vibrant Village Programme

    • The program aims to improve infrastructure in villages along India’s border with China.
    • Infrastructure will be improved in states like Uttarakhand, Himachal Pradesh, and Arunachal Pradesh.
    • Under the programme, residential and tourist centres will be constructed.
    • It will also provide for improvement in road connectivity and development of decentralized renewable energy sources.
    • Apart from that, direct access of Doordarshan and education related channels will be provided. Support will be provided for livelihood.

    Key focus areas

    • It focuses on livelihood generation, road connectivity, housing, rural infrastructure, renewable energy, television and broadband connections.
    • This objective will be met by strengthening infrastructure across villages located near the Line of Actual Control (LAC).

    Need for such scheme

    • The programme is a counter to China’s model villages but the name has been carefully chosen so as to not cause any consternation in the neighbouring country.
    • China has established new villages along the LAC in the past few years, particularly across the Arunachal Pradesh border.
    • While China has been settling new residents in border areas, villages on the Indian side of the frontier have seen unprecedented out-migration.

     

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  • What is Social Stock Exchange (SSE)?

    social

    The National Stock Exchange of India (NSE India) received an in-principle approval from the Securities Exchange Board of India (SEBI) to set-up Social Stock Exchange (SSE) as a separate segment.

    What is Social Stock Exchange (SSE)?

    • SSE is a novel idea in India, and a stock exchange of this kind is intended to benefit the private and non-profit sectors by directing more capital to them.
    • During her Budget speech for the fiscal year 2019–20, Finance Minister first proposed the concept of SSE.
    • The Securities Contracts (Regulation) Act, 1956 was then invoked by the government, which subsequently published a gazette notification announcing a new security as “zero coupon zero principal”.
    • The SSE will function as a distinct division of the current stock exchanges under the new regulations.

    Who can list on SSE?

    • The SSE will be a distinct division of the current stock exchanges under the new regulations.
    • Not-for-profit organisations (NPOs) and for-profit social enterprises with social intent and impact as their primary goal will be eligible to participate in the SSE.
    • Additionally, such an intent should be shown by its emphasis on social goals that are appropriate for under-served or less privileged populations or areas.
    • The social enterprises will have to engage in a social activity out of 16 broad activities listed by the regulator.

    The eligible activities include-

    1. Eradicating hunger poverty, malnutrition and inequality
    2. Promoting healthcare, supporting education, employability and livelihoods
    3. Gender equality empowerment of women and LGBTQIA communities
    4. Supporting incubators of social enterprise

    Who are not eligible?

    • Corporate foundations, political or religious organisations or activities, professional or trade associations, infrastructure companies, and housing companies, with the exception of affordable housing, will not be eligible to be identified as social enterprises.
    • According to SEBI’s framework, minimum issue size of ₹1 crore and a minimum application size for subscription of ₹2 lakh are currently required for SSE.

    Minimum requirements for sustenance

    • NPO needs to be registered as a charitable trust and should be registered for at least three years, must have spent at least ₹50 lakh annually in the past financial year.
    • They should have received a funding of at least ₹10 lakh in the past financial year.

     

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  • City Finance Rankings, 2022

    The Centre launched City Finance Rankings 2022 and City Beauty Competition aimed at incentivising urban local bodies for improving cities’ public infrastructure and strengthening them on basis of key financial parameters.

    What is City Finance Rankings?

    • It aims to evaluate, recognise, and reward urban local bodies on the basis of their strength across key financial parameters.
    • City Finance Rankings aim to motivate city and state officials and decision makers, to implement municipal finance reforms.
    • The participating urban local bodies will be evaluated on 15 indicators across three key municipal finance assessment parameters like resource mobilisation, expenditure performance, and fiscal governance.
    • The cities will be ranked at the national level on the basis of their scores under any one of the following four population categories:
    1. Above 40 lakh
    2. Between 10-40 lakh
    3. 1 lakh to 10 lakh and
    4. Less than one lakh
    • The top three cities in each population category will be recognised and rewarded at the national level as well as within each state and state cluster

    About City Beauty Competition

    • Wards and public places of cities would be judged against the five broad pillars (i) accessibility (ii) amenities (iii) activities (iv) aesthetics and (v) ecology.
    • It would felicitate most beautiful wards and beautiful public places at the city level.
    • It aims to encourage and recognise the transformational efforts made by cities and wards in India to create beautiful, innovative and inclusive public spaces

     

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  • Amrit Bharat Station Scheme

    The Ministry of Railways, as part of its station redevelopment drive, has formulated Amrit Bharat Station Scheme to modernize over 1,000 small stations over the coming years.

    Amrit Bharat Station Scheme

    • Under this, stations will be equipped with facilities inspired by the mega-upgradation of marquee stations such as New Delhi and Ahmedabad, albeit at a lower cost.
    • Key features of these proposed stations include provisions for roof top plazas, longer platforms, ballast-less tracks, and 5G connectivity.
    • The scheme will subsume all previous redevelopment projects where work is yet to begin.

    Implementation strategy

    • The model envisages low-cost redevelopment of stations which can be executed timely.
    • Zonal railways have been given the responsibility of selecting stations, which will then be approved by a committee of senior railway officials.
    • Plans and consequent budgets will only be approved on the basis of factors such as footfall and inputs from stakeholders.

    Facilities Planned under this Scheme

    • Provision for Roof Plaza to be created in future
    • Free Wi-Fi, space for 5G mobile towers
    • Smooth access by widening of roads, removal of unwanted structures, properly designed signages, dedicated pedestrian pathways, well-planned parking areas, improved lighting etc.
    • High level platforms (760-840 mm) at all stations with a length of 600 metres
    • Special amenities for the disabled

     

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  • Five space exploration missions to look out for in 2023

    2023 is set to be another busy year. Here are five of the most exciting missions to watch out for.

    (1) Jupiter Icy Moons Explorer

    space

    • In April, the European Space Agency (ESA) is set to launch the Jupiter Icy Moons Explorer (Juice), in what will be Europe’s first dedicated robotic mission to Jupiter.
    • Juice is due to reach the planet in July 2031 after performing an incredible flight path through the Solar System.
    • The mission will enter into orbit around Jupiter and perform numerous flybys of its large icy moons: Europa, Ganymede and Callisto.
    • After four years of moon flybys, Juice will then enter into orbit around Ganymede, the largest moon in the Solar System — becoming the first spacecraft ever to reach orbit around the moon of another planet.
    • The icy moons of Jupiter are interesting as they are all believed to host oceans of liquid water beneath their frozen surfaces.
    • Europa, in particular, is regarded as one of the most likely abodes in the Solar System for extra-terrestrial life.

    (2) SpaceX Starship

    space

    • Starship will be the largest spacecraft capable of carrying humans from Earth to destinations in space (the International Space Station is larger, but it was assembled in space).
    • It will be the most powerful launch vehicle ever to fly, capable of lifting 100 tonnes of cargo to low Earth orbit.
    • Starship is the collective name for a two-component system consisting of the Starship spacecraft (which carries the crew and cargo) and the Super Heavy rocket.
    • The rocket component will lift Starship to some 65km altitude before separating and returning to Earth in a controlled landing.
    • The upper Starship component will then use its own engines to push itself the rest of the way to orbit.

    (3) dearMoon Project

    space

    • The long-awaited dearMoon project, which will take members of the public on a six-day trip around the Moon and back, is due for launch on Starship and was originally planned for 2023.
    • It will be the first true deep space tourism launch.
    • This mission will mark a big change in the way we think about space, as previously only astronauts picked using incredibly stringent criteria have been able to go into deep space.
    • The success or failure of the dearMoon mission could affect whether deep space tourism becomes the next big thing, or it is relegated back to being a pipe-dream.

    (4) OSIRIS-REx returning Earth

    space

    • The Origins Spectral Interpretation Resource Identification Security — Regolith Explorer, mercifully more commonly known as OSIRIS-REx, is a NASA mission to near-Earth asteroid Bennu.
    • A key goal of this robotic mission was to acquire samples of Bennu and return them to Earth for analysis.
    • OSIRIS-REx is now fast returning to Earth with up to a kilogram of precious asteroid samples stored aboard.
    • If all goes well, the capsule will detach from the spacecraft, enter the Earth’s atmosphere and parachute to a soft landing in the deserts of Utah.
    • Asteroid sample return has only been achieved once before, by the Japanese Space Agency’s Hayabusa 2 mission in 2020.
    • Bennu is an approximately diamond-shaped world just half a kilometre in size, but has many interesting characteristics.
    • Some of the minerals detected within it have been altered by water, implying that Bennu’s ancient parent body possessed liquid water.
    • It also has an abundance of precious metals, including gold and platinum.
    • It is however classed as a potentially hazardous object with a (very) small possibility of Earth impact in the next century.

    (5) India’s private space launch

    • Skyroot Aerospace, which successfully launched its Vikram-S rocket in November 2022, is soon to become the first private Indian company to launch a satellite.
    • The rocket itself reached 90km in altitude, a distance that would need to be improved upon to get a constellation of satellites into orbit.
    • Skyroot’s first satellite launch is planned for 2023, with a goal of undercutting the cost of private space launch rivals by producing its 3D-printed rockets in a matter of days.
    • If successful, this could also provide a route for cheaper launches of scientific missions, enabling a faster rate of research.

    Conclusion

    • With many bold advances and launches due in 2023, we are entering a new phase akin to the “Golden era” of space launches in the 1960s and ’70s.
  • Naegleria fowleri: The Brain-eating Amoeba

    naegleria

    South Korea reported its first case of infection from Naegleria fowleri or “brain-eating amoeba”.

    What is Naegleria fowleri (Amoeba)?

    • Amoeba is a type of cell or unicellular organism with the ability to alter its shape, primarily by extending and retracting pseudopods.
    • Naegleria is an amoeba, a single-celled organism, and only one of its species, called Naegleria fowleri, can infect humans.
    • It was first discovered in Australia in 1965 and is commonly found in warm freshwater bodies, such as hot springs, rivers and lakes.
    • So far, Naegleria fowleri has been found in all continents and declared as the cause of PAM in over 16 countries, including India.

    How does it infect humans?

    • The amoeba enters the human body through the nose and then travels up to the brain.
    • This can usually happen when someone goes for a swim, or dive or even when they dip their head in a freshwater body.
    • In some cases, it was found that people got infected when they cleaned their nostrils with contaminated water/ vapour/ or aerosol droplets.
    • Once Naegleria fowleri goes to the brain, it destroys brain tissues and causes a dangerous infection known as primary amebic meningoencephalitis (PAM).

    What are the symptoms of PAM?

    • The CDC says the first signs of PAM start showing within one to 12 days after the infection.
    • In the initial stages, they might be similar to symptoms of meningitis, which are headache, nausea and fever.
    • In the later stages, one can suffer from a stiff neck, seizures, hallucinations, and even coma.
    • The infection spreads rapidly and on average causes death within about five days.

    How its spread is linked to climate change?

    • With the rising global temperatures, the chances of getting Naegleria fowleri infection will go up as the amoeba mainly thrives in warm freshwater bodies.
    • The organism best grows in high temperatures up to 46°C and sometimes can survive at even higher temperatures.
    • Various recent studies have found that excess atmospheric carbon dioxide has led to an increase in the temperature of lakes and rivers.
    • These conditions provide a more favourable environment for the amoeba to grow.

     

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  • Pralay: India’s first tactical quasi-ballistic missile

    pralay

    The Defence Ministry has decided to deploy indigenously developed surface-to-surface ‘Pralay’ ballistic missiles near India’s borders with China and Pakistan.

    What are Tactical Missiles?

    • Generally, short-range missiles are termed tactical while long-range missiles are termed strategic.
    • A missile which is used to destroy tactical targets of enemy like bunkers, mortar position, artillery position etc. is tactical missile.
    • Battlefield missiles are tactical while long-range missiles targeting bigger targets like cities are termed strategic.
    • Features of these missiles include-
    1. Versatile range: Tactical missiles fills the gap between long range rockets and short range ballistic missiles , and have range mainly about 100 to 200 kms .
    2. Very high precision and accuracy: These missiles are highly accurate, and can destroy small steady and moving targets with high accuracy.

    About ‘Pralay’ Missile

    • Pralay is a Hindi word which means “apocalypse” or “to cause great destruction” or “damage”.
    • The Pralay missile project was sanctioned in 2015 and is a derivative of the Prahaar missile programme, which was first tested in 2011.
    • Developed by the DRDO, the ‘Pralay’ ballistic missile is a canisterised tactical, surface-to-surface, and short-range ballistic missile (SRBM) for battlefield use.
    • It can hit targets from a distance of 150 to 500 km and is extremely difficult to intercept by enemy interceptor missiles.
    • Pralay is powered by a solid fuel rocket motor and is a high explosive preformed fragmentation warhead that weighs somewhere between 350 kg to 700 kg.
    • It also accounts for its Penetration-Cum-Blast (PCB) and Runaway Denial Penetration Submunitions (RDPS).

    Unique features of Pralay

    • Precise targeting: The missile is designed to destroy enemy radar, communication installations, command centres and airfields.
    • Quasi Ballistic Trajectory: It means the object takes a low curved path after being shot.
    • Stealth features: Pralay has the ability to evade any anti-ballistic missile (ABM) interceptors by performing mid-air manoeuvres by using a manoeuvrable re-entry vehicle.
    • Destruction capability: When a high-explosive warhead, like the one Pralay missile is equipped with, explodes, its pieces are thrown at a high speed which can inflict heavy damage.

    What makes Pralay lethal?

    • The Indian missile can be compared to China’s Dong Feng 12 and the Russian Iskander missile that has been used in the ongoing war with Ukraine.
    • The US Army is in the process of increasing the range of a similar short-range ballistic missile called the Precision Strike Missile (PrSM).
    • What makes Pralay deadly is that it is a quasi-ballistic weapon, which means that while it has a low trajectory and is largely ballistic, it can manoeuvre in flight.
    • Unlike intercontinental ballistic missiles that exit the Earth’s atmosphere, short-range ballistic missiles stay within it.

    What lies ahead?

    • Pralay, along with the BrahMos supersonic cruise missile, will form the crux of India’s planned Rocket Force — a concept that was envisaged by former Chief of Defence Staff (CDS), the late General Bipin Rawat.
    • Only conventional missiles would come under the planned Rocket Force as and when it’s ready, while nuclear weapons would continue to be under the ambit of the Strategic Forces Command.

     

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  • In news: Ratnagiri Prehistoric Geoglyphs

    geoglyph

    Experts and conservationists have raised concerns over the proposed location for a mega oil refinery in Barsu village of Maharashtra’s Ratnagiri district.

    What are geoglyphs?

    • Geoglyphs are a form of prehistoric rock art, created on the surface of laterite plateaus.
    • They are made by removing a part of the rock surface through an incision, picking, carving or abrading.
    • They can be in the form of rock paintings, etchings, cup marks and ring marks.

    Ratnagiri’s geoglyphs

    • Clusters of geoglyphs are spread across the Konkan coastline in Maharashtra and Goa, spanning around 900 km.
    • Porous laterite rock, which lends itself to such carving, is found on a large scale across the entire region.
    • Ratnagiri district has more than 1,500 pieces of such art, also called “Katal shilpa,” spread across 70 sites.
    • The figures depicted in the geoglyphs include humans and animals such as deer, elephant, tiger, monkey, wild boar, rhinoceros, hippopotamus, cattle, pig, rabbit, and monkey.
    • Moreover, they also include a high number of reptilian and amphibian creatures such as tortoises and alligators, aquatic animals such as sharks and sting rays, and birds like peacocks.

    Why are they significant?

    • Tourism potential: Ratnagiri’s prehistoric sites are among three Indian attractions that may soon become World Heritage Sites. The other two include Jingkieng Jri, the living root bridge in Meghalaya, and Sri Veerabhadra Temple in Andhra Pradesh’s Lepakshi.
    • Evolution of art: The geoglyph clusters also are examples of advanced artistic skills, showing the evolution of techniques of etching and scooping in rock art.

     

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