Astronomers discover 83 supermassive black holes 13 billion light-years away

Agencies
March 15, 2019

Washington, Mar 15: Astronomers have discovered 83 quasars powered by supermassive black holes 13 billion light-years away from the Earth, from a time when the universe was less than 10 per cent of its present age.

“It is remarkable that such massive dense objects were able to form so soon after the Big Bang,” said Michael Strauss, a professor at Princeton University in the US.

“Understanding how black holes can form in the early universe, and just how common they are, is a challenge for our cosmological models,” Strauss said in a statement.

This finding, published in The Astrophysical Journal, increases the number of black holes known at that epoch  considerably, and reveals, for the first time, how common they are early in the universe’s history.

In addition, it provides new insight into the effect of black holes on the physical state of gas in the early universe in its first billion years.

Supermassive black holes, found at the centers of galaxies, can be millions or even billions of times more massive than the Sun.

While they are prevalent today, it is unclear when they first formed, and how many existed in the distant early universe.

A supermassive black hole becomes visible when gas accretes onto it, causing it to shine as a “quasar.” Previous studies have been sensitive only to the very rare, most luminous quasars, and thus the most massive black holes.

The new discoveries probe the population of fainter quasars, powered by black holes with masses comparable to most black holes seen in the present-day universe.

The team used data taken with “Hyper Suprime-Cam” (HSC) instrument, mounted on the Subaru Telescope of the National Astronomical Observatory of Japan, which is located on the summit of Maunakea in Hawaii.

The researchers selected distant quasar candidates from the sensitive HSC survey data.

They then carried out an intensive observational campaign to obtain spectra of those candidates, using three telescopes: the Subaru Telescope; the Gran Telescopio Canarias on the island of La Palma in the Canaries, Spain; and the Gemini South Telescope in Chile.

The survey revealed 83 previously unknown very distant quasars.

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ABDUL AZIZ SHE…
 - 
Saturday, 16 Mar 2019

SUBHAANALLAH

 

 
ALLAH ALMIGHTY CREATED EVERTHING  INCLUDING WHOLE UNIVERSE AND WHAT IS IN IT,

HUMAN BEING CANNOT REACH TO UNDERSTAND IT,  HUMAN LIFE NOT SUFFEICENT TO REACH AND KNOW EVERYTHING.

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News Network
July 26,2020

New Delhi, Jul 26: Union Home Minister Amit Shah on Sunday saluted the valour and grit of the Indian soldiers on the occasion of 21st anniversary of the 'Kargil Vijay Diwas'.

Shah took to Twitter and said that 'Kargil Vijay Diwas' is a symbol of India's proud, valour and steadfast leadership.

"Kargil Vijay Diwas is a symbol of India's proud, valor and steadfast leadership. I bow to the soldiers who, with their indomitable courage, drove the enemy from the inaccessible hills of Kargil and waved the tricolor there again. The country is proud of the heroes of India, who are dedicated to protecting the motherland," Shah tweeted (translated from Hindi)
The country is celebrating the anniversary of the 'Kargil Vijay Diwas'.

The Indian armed forces had defeated Pakistan on July 26, 1999. Since then, the day is celebrated as 'Kargil Vijay Diwas' to rekindle the pride and valour of the soldiers who took part in Operation Vijay.

The day marks the victory of Indian soldiers in recapturing the mountain heights that were occupied by the Pakistani Army on July 26, 1999, known as the Kargil War. 

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Agencies
July 29,2020

Dubai, Jul 29: Muslim pilgrims on Wednesday begin the annual Haj, downsized this year as the Saudi hosts strive to prevent a coronavirus outbreak during the five-day pilgrimage.

The Haj, one of the five pillars of Islam and a must for able-bodied Muslims at least once in their lifetime, is usually one of the world's largest religious gatherings.

But this year only up to 10,000 people already residing in the Kingdom will participate in the ritual, a tiny fraction of the 2.5 million pilgrims from around the world that attended last year.

"There are no security-related concerns in this pilgrimage, but (downsizing) is to protect pilgrims from the danger of the pandemic," said Khalid bin Qarar Al Harbi, Saudi Arabia's director of public security.

Pilgrims will be required to wear masks and observe social distancing during a series of religious rites that are completed over five days in the holy city of Makkah and its surroundings in western Saudi Arabia.

Those selected to take part in the Haj were subject to temperature checks and placed in quarantine as they began trickling into Makkah at the weekend.

State media showed health workers sanitising their luggage, and some pilgrims reported being given electronic wristbands to allow authorities to monitor their whereabouts.

Workers, clutching brooms and disinfectant, were seen cleaning the area around the Kaaba, the structure at the centre of the Grand Mosque draped in gold-embroidered cloth towards which Muslims around the world pray.

Haj authorities have cordoned off the Holy Kaaba this year, saying pilgrims will not be allowed to touch it, to limit the chances of infection.

They also reported setting up multiple health facilities, mobile clinics and ambulances to cater to the pilgrims.

Saudi authorities said only around 1,000 pilgrims residing in the Kingdom would be permitted for the Haj. Some 70 per cent of the pilgrims are foreigners residing in the Kingdom, while the rest will be Saudi citizens, authorities said.

All worshippers were required to be tested for coronavirus before arriving in the holy city of Makkah and will also have to quarantine after the pilgrimage as the number of cases in the Kingdom nears 270,000.

They were given elaborate amenity kits that include sterilised pebbles for a stoning ritual, disinfectants, masks, a prayer rug and the Ihram, a seamless white garment worn by pilgrims, according to a Haj ministry programme document.

"I did not expect, among millions of Muslims, to be blessed with approval," Emirati pilgrim Abdullah Al Kathiri said in a video released by the Saudi media ministry.

"It is an indescribable feeling... especially since it is my first pilgrimage."

The Haj ministry said non-Saudi residents of the Kingdom from around 160 countries competed in the online selection process but it did not say how many people applied.

Despite the pandemic, many pilgrims consider it safer to participate in this year's ritual without the usual colossal crowds cramming into tiny religious sites, which make it a logistical nightmare and a health hazard.

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Agencies
June 28,2020

The US space agency has thrown open a challenge to win over Rs 26 lakh, calling the global community to send novel design concepts for compact toilets that can operate in both microgravity and lunar gravity.

NASA is preparing for return to the Moon and innumerable activities to equip, shelter, and otherwise support future astronauts are underway.

The astronauts will be eating and drinking, and subsequently urinating and defecating in microgravity and lunar gravity.

NASA said that while astronauts are in the cabin and out of their spacesuits, they will need a toilet that has all the same capabilities as ones here on Earth.

The public designs for space toilet may be adapted for use in the Artemis lunar landers that take humans back to the Moon.

"Although space toilets already exist and are in use (at the International Space Station, for example), they are designed for microgravity only," the US space agency said in a statement.

NASA's Human Landing System Programme is looking for a next-generation device that is smaller, more efficient, and capable of working in both microgravity and lunar gravity.

The new NASA challenge includes a Technical category and Junior category and the last date to send designs is August 17.

NASA's Artemis Moon mission will land the first woman and next man on the lunar surface by 2024.

The Artemis programme is part of America's broader Moon to Mars exploration approach, in which astronauts will explore the Moon and experience gained there to enable humanity's next giant leap, sending humans to Mars.

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