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Indian astronomers discover a supercluster of galaxies, name it Saraswati

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Indian astronomers discover a supercluster of galaxies, name it SaraswatiIndian astronomers discover a supercluster of galaxies, name it Saraswati

[vc_row][vc_column][vc_column_text]A team of Indian astronomers have identified an extremely large supercluster of galaxies and have named it Saraswati.

This previously unknown, extremely large supercluster of galaxies, was discovered by a team of astronomers from the Inter University Centre for Astronomy & Astrophysics (IUCAA), and Indian Institute of Science Education and Research (IISER), both in Pune, India, and members of two other Indian universities. The team was led by Joydeep Bagchi from IUCAA, while others included Shishir Sankhyayan, a PhD student at IISER, Pratik Dabhade, an IUCAA research fellow, Joe Jacob of the Newman College, Kerala, and Prakash Sarkar of the National Institute of Technology, Jamshedpur.

The discovery comes close on the heels of another, reported on July 1, of “a large sample of giant radio galaxies” by the same institution. A six-member team of Indian astronomers led by Pratik Dabhade from IUCAA had reported the discovery of 25 extremely rare kind of galaxies called giant radio galaxies (GRGs), known to be the largest known galaxies in the universe. Bagchi was also part of the team.

Saraswati supercluster, located in the direction of constellation Pisces, is one of the largest known structures in the nearby Universe, and is at a distance of 4,000 million (400 crore) light-years away from us. Our own galaxy is part of a Supercluster called the Laniakea Supercluster, announced in 2014 by Brent Tully at the University of Hawaii and collaborators.

Superclusters are the largest coherent structures in the Cosmic Web. A Supercluster is a chain of galaxies and galaxy clusters, bound by gravity, often stretching to several hundred times the size of clusters of galaxies, consisting of tens of thousands of galaxies. The newly discovered ‘Saraswati’ supercluster, for instance, extends over a scale of 600 million light-years and may contain the mass equivalent of over 20 million billion suns. \

The Saraswati supercluster has a total of 43 clusters of galaxies. The typical size of a galaxy here is around 250,000 light years.

Two most massive clusters of galaxies in the Saraswati supercluster : “ABELL 2631” cluster (left) and “ZwCl 2341.1+0000” cluster (right). “ABELL 2631” resides in the core of the Saraswatisupercluster. The Saraswati supercluster has a total of 43 clusters of galaxies.

Two most massive clusters of galaxies in the Saraswati supercluster : “ABELL 2631” cluster (left) and “ZwCl 2341.1+0000” cluster (right). “ABELL 2631” resides in the core of the Saraswatisupercluster. The Saraswati supercluster has a total of 43 clusters of galaxies.

In a press statement, Joydeep Bagchi from IUCAA, the lead author of the paper and co-author Shishir Sankhyayan (PhD scholar at IISER, Pune) said, “We were very surprised to spot this giant wall-like supercluster of galaxies, visible in a large spectroscopic survey of distant galaxies, known as the Sloan Digital Sky Survey (see figure above). This supercluster is clearly embedded in a large network of cosmic filaments traced by clusters and large voids.”

Previously only a few comparatively large superclusters have been reported, for example the ‘Shapley Concentration’ or the ‘Sloan Great Wall’ in the nearby universe, while the ‘Saraswati’ supercluster is far more distant one. “Our work will help to shed light on the perplexing question; how such extreme large scale, prominent matter-density enhancements had formed billions of years in the past when the mysterious Dark Energy had just started to dominate structure formation,” said Bagchi.

“Saraswati” (or “Sarasvati”), a word that has proto-Indo-European roots, is a name found in ancient Indian texts to refer to the major river around which the people of the ancient Indian civilization lived. It is also the name of the celestial goddess who is the keeper of the celestial rivers. In modern India, Saraswati is worshipped as the goddess of knowledge, music, art, wisdom and nature – the muse of all creativity.

Their finding will be published in the latest issue of The Astrophysical Journal, one of the premier research journals of the American Astronomical Society.[/vc_column_text][/vc_column][/vc_row]

India News

Delhi air quality plunges to severe as thick smog blankets the capital

Delhi’s air quality deteriorated sharply with AQI entering the ‘severe’ zone across several areas, prompting enforcement of GRAP stage-IV measures.

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Delhi's air quality

Delhi woke up to hazardous air conditions on Tuesday as dense smog covered large parts of the national capital, pushing the Air Quality Index (AQI) into the ‘severe’ category across several locations. Poor visibility and rising health concerns marked yet another spell of extreme pollution in the city.

Data from the Central Pollution Control Board (CPCB) showed the overall AQI in Delhi touching 413 in the morning, placing it firmly in the ‘severe’ bracket. Several areas across the National Capital Region (NCR) reported alarming pollution levels, indicating a widespread deterioration in air quality.

Pollution hotspots report hazardous readings

Some of Delhi’s major pollution hotspots recorded extremely high AQI levels. Anand Vihar topped the list with an AQI of 466, followed by Ashok Vihar at 444 and Chandni Chowk at 425. These areas remained in the ‘severe’ category, posing serious health risks, especially for children, the elderly and those with respiratory conditions.

Even central parts of the city were not spared. India Gate, Kartavya Path and the Rashtrapati Bhavan area were shrouded in toxic smog, with AQI levels around 384, categorised as ‘very poor’.

GRAP stage-IV measures enforced across Delhi-NCR

In response to the worsening situation, the Commission for Air Quality Management (CAQM) enforced all actions under GRAP Stage-IV across Delhi-NCR. As part of these emergency measures, truck-mounted water sprinklers were deployed to suppress dust and reduce particulate matter in the air.

As per AQI standards, readings between 401 and 500 fall under the ‘severe’ category, while levels above 300 are considered ‘very poor’, highlighting the seriousness of the current conditions.

Delhi government reviews pollution control steps

The Delhi government has reiterated its commitment to tackling rising pollution levels with strict enforcement measures. Chief Minister Rekha Gupta stated that a zero-tolerance policy will be followed against all sources contributing to air pollution in the capital.

A high-level review meeting was held at the Delhi Secretariat to assess existing measures and take further decisions. The meeting focused on enforcing Pollution Under Control (PUC) norms without any relaxation, exploring pooled and shared electric bus services across Delhi-NCR, issuing fresh guidelines for e-rickshaws, and rationalising Delhi Transport Corporation (DTC) bus routes.

Senior officials from the Environment and Transport Departments, the Delhi Pollution Control Committee (DPCC), Public Works Department (PWD) and Delhi Traffic Police, along with Environment Minister Manjinder Singh Sirsa, attended the meeting to finalise immediate and long-term steps to address the pollution crisis.

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India News

Rahul Gandhi alleges institutional bias, questions electoral system during Berlin address

Rahul Gandhi alleged that India’s institutions and electoral system have been weaponised to favour the BJP, remarks that sparked a strong political response.

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Rahul-Gandhi

Leader of the Opposition in the Lok Sabha, Rahul Gandhi, has said that India’s institutional framework is facing a serious challenge and has been used to favour the ruling BJP. Speaking during an interaction at the Hertie School in Berlin, Gandhi questioned the functioning of key institutions and the electoral machinery, remarks that triggered a sharp political response from the BJP.

Gandhi said the Congress believes there is a problem with the electoral system and alleged that several institutions have been captured. Referring to investigative agencies, he claimed that bodies such as the CBI and the ED have been used as political tools. According to him, cases filed by these agencies overwhelmingly target those opposing the BJP, while leaders from the ruling party face none.

He also pointed to what he described as a stark financial imbalance between the BJP and the opposition, claiming a funding ratio of 30:1. Gandhi said this disparity reflects how institutions are being used to consolidate political power.

Opposition strategy and INDIA alliance

The Congress leader said merely pointing out problems in elections is not enough and stressed the need for the opposition to build a system of resistance that can effectively counter the ruling party. He added that the challenge now goes beyond electoral contests and is about presenting an alternative vision for the country.

On the INDIA alliance, Gandhi said the unity among opposition parties is rooted in their rejection of the ideological position of the RSS. While acknowledging that tactical contests between alliance partners will continue, he said they remain united when it comes to opposing laws they disagree with and working together in Parliament.

BJP hits back at remarks abroad

Gandhi’s comments delivered overseas drew a strong reaction from the BJP. Party president and Union minister JP Nadda accused him of speaking against India while Parliament is in session and claimed that he was undermining the country’s image at a time when the Prime Minister is receiving global recognition.

BJP spokesperson Shehzad Poonawalla also criticised Gandhi, alleging that he routinely travels abroad to defame India. He accused the Congress leader of making misleading claims about the country’s institutions and economic activity while praising China.

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India News

DU VC Prof Yogesh Singh entrusted with additional charge of AICTE Chairman

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Prof. Yogesh Singh, Vice Chancellor of the University of Delhi, has been entrusted with the additional charge of the post of Chairman, AICTE till the appointment of a Chairman of AICTE or until further orders, whichever is earlier.

It is noteworthy that AICTE Chairman Prof. TG Sitharam was relieved of his duties after his term ended on December 20, 2025. According to a letter issued by the Ministry of Education, Government of India, on Monday, Prof. Yogesh Singh’s appointment is until the appointment of a regular AICTE Chairman or until further orders whichever is earlier.

Prof. Yogesh Singh is a renowned academician with excellent administrative capabilities, who has been the Vice-Chancellor of University of Delhi since October 2021. He has also served as the Chairperson of the National Council for Teacher Education. In August 2023, he was also given the additional charge of Director of the School of Planning and Architecture (SPA).

Prof. Yogesh Singh served as the Vice-Chancellor of Delhi Technological University from 2015 to 2021; Director of Netaji Subhas Institute of Technology, Delhi from 2014 to 2017, and before that, he was the Vice-Chancellor of Maharaja Sayajirao University, Baroda (Gujarat) from 2011 to 2014. He holds a Ph.D. in Computer Engineering from the National Institute of Technology, Kurukshetra. He has a distinguished track record in quality teaching, innovation, and research in the field of software engineering.

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