Astronomers Find What May Be the Universe’s Brightest Object with a Black Hole Devouring a Sun a Day

An undated handout photo made available by the European Southern Observatory (ESO) shows an artist's impression of the record-breaking quasar J059-4351, the bright core of a distant galaxy that is powered by a supermassive black hole (issued 19 February 2024). (EPA/ESO/M. Kornmesser / Handout)
An undated handout photo made available by the European Southern Observatory (ESO) shows an artist's impression of the record-breaking quasar J059-4351, the bright core of a distant galaxy that is powered by a supermassive black hole (issued 19 February 2024). (EPA/ESO/M. Kornmesser / Handout)
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Astronomers Find What May Be the Universe’s Brightest Object with a Black Hole Devouring a Sun a Day

An undated handout photo made available by the European Southern Observatory (ESO) shows an artist's impression of the record-breaking quasar J059-4351, the bright core of a distant galaxy that is powered by a supermassive black hole (issued 19 February 2024). (EPA/ESO/M. Kornmesser / Handout)
An undated handout photo made available by the European Southern Observatory (ESO) shows an artist's impression of the record-breaking quasar J059-4351, the bright core of a distant galaxy that is powered by a supermassive black hole (issued 19 February 2024). (EPA/ESO/M. Kornmesser / Handout)

Astronomers have discovered what may be the brightest object in the universe, a quasar with a black hole at its heart growing so fast that it swallows the equivalent of a sun a day.

The record-breaking quasar shines 500 trillion times brighter than our sun. The black hole powering this distant quasar is more than 17 billion times more immense than our sun, an Australian-led team reported Monday in the journal Nature Astronomy.

While the quasar resembles a mere dot in images, scientists envision a ferocious place.

The rotating disk around the quasar's black hole — the luminous swirling gas and other matter from gobbled-up stars — is like a cosmic hurricane.

“This quasar is the most violent place that we know in the universe,” lead author Christian Wolf of Australian National University said in an email.

The European Southern Observatory spotted the object, J0529-4351, during a 1980 sky survey, but it was thought to be a star. It was not identified as a quasar — the extremely active and luminous core of a galaxy — until last year. Observations by telescopes in Australia and Chile’s Atacama Desert clinched it.

“The exciting thing about this quasar is that it was hiding in plain sight and was misclassified as a star previously,” Yale University's Priyamvada Natarajan, who was not involved in the study, said in an email.

These later observations and computer modeling have determined that the quasar is gobbling up the equivalent of 370 suns a year — roughly one a day. Further analysis shows the mass of the black hole to be 17 to 19 billion times that of our sun, according to the team. More observations are needed to understand its growth rate.

The quasar is 12 billion light-years away and has been around since the early days of the universe. A light-year is 5.8 trillion miles.



Greece's 'Instagram Island' Santorini nears Saturation Point

Tourists queue as they wait to take a picture from one of the balconies. Aris Oikonomou / AFP
Tourists queue as they wait to take a picture from one of the balconies. Aris Oikonomou / AFP
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Greece's 'Instagram Island' Santorini nears Saturation Point

Tourists queue as they wait to take a picture from one of the balconies. Aris Oikonomou / AFP
Tourists queue as they wait to take a picture from one of the balconies. Aris Oikonomou / AFP

One of the most enduring images of Greece's summer travel brand is the world-famous sunset on Santorini Island, framed by sea-blue church domes on a jagged cliff high above a volcanic caldera.
This scene has inspired millions of fridge magnets, posters, and souvenirs -- and now the queue to reach the viewing spot in the clifftop village of Oia can take more than 20 minutes, said AFP.
Santorini is a key stopover of the Greek cruise experience. But with parts of the island nearing saturation, officials are considering restrictions.
Of the record 32.7 million people who visited Greece last year, around 3.4 million, or one in 10, went to the island of just 15,500 residents.
"We need to set limits if we don't want to sink under overtourism," Santorini mayor Nikos Zorzos told AFP.
"There must not be a single extra bed... whether in the large hotels or Airbnb rentals."
As the sun set behind the horizon in Oia, thousands raised their phones to the sky to capture the moment, followed by scattered applause.
For canny entrepreneurs, the Cycladic island's famous sunset can be a cash cow.
One company advertised more than 50 "flying dresses", which have long flowing trains, for up to 370 euros ($401), on posters around Oia for anyone who wishes to "feel like a Greek goddess" or spruce up selfies.
'Respect Oia'
But elsewhere in Oia's narrow streets, residents have put up signs urging visitors to respect their home.
"RESPECT... It's your holiday... but it's our home," read a purple sign from the Save Oia group.
Shaped by a volcanic eruption 3,600 years ago, Santorini's landscape is "unique", the mayor said, and "should not be harmed by new infrastructure".
Around a fifth of the island is currently occupied by buildings.
At the edge of the cliff, a myriad of swimming pools and jacuzzis highlight Santorini is also a pricey destination.
In 2023, 800 cruise ships brought some 1.3 million passengers, according to the Hellenic Ports Association.
Cruise ships "do a lot of harm to the island", said Chantal Metakides, a Belgian resident of Santorini for 26 years.
"When there are eight or nine ships pumping out smoke, you can see the layer of pollution in the caldera," she said.
Cruise ship limits
In June, Prime Minister Kyriakos Mitsotakis floated the possibility of capping cruise ship arrivals to Greece's most popular islands.
"I think we'll do it next year," he told Bloomberg, noting that Santorini and tourist magnet Mykonos "are clearly suffering".
"There are people spending a lot of money to be on Santorini and they don’t want the island to be swamped," said the pro-business conservative leader, who was re-elected to a second four-year term last year.
In an AFP interview, Tourism Minister Olga Kefalogianni echoed this sentiment and said: "We must set quotas because it's impossible for an island such as Santorini... to have five cruise ships arriving at the same time."
Local officials have set a limit of 8,000 cruise boat passengers per day from next year.
But not all local operators agree.
Antonis Pagonis, head of Santorini's hoteliers association, believes better visitor flow management is part of the solution.
"It is not possible to have (on) a Monday, for example, 20 to 25,000 guests from the cruise ships, and the next day zero," he said.
Pagonis also argued that most of the congestion only affects parts of the island like the capital, Fira.
In the south of the island, the volcanic sand beaches are less crowded, even though it is high season in July.
'I'm in Türkiye
The modern tourism industry has also changed visitor behavior.
"I listened (to) people making a FaceTime call with the family, saying 'I'm in Türkiye," smiled tourist guide Kostas Sakavaras.
"They think that the church over there is a mosque because yesterday they were in Türkiye."
The veteran guide said the average tourist coming to the island has changed.
"Instagram has defined the way people choose the places to visit," he said, explaining everybody wants the perfect Instagram photo to confirm their expectations.