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Astronomers have spotted the most powerful cosmic explosion ever seen — a mysterious, years-long eruption 10 times brighter than any observed supernova.

Astronomers spotted the  event, named AT2021lwx, 8 billion light-years from Earth. Releasing roughly 100 times the energy the sun will release over its entire lifetime, the strange explosion burst into activity when the universe was 6 billion years old.

“We came upon this by chance, as it was flagged by our search algorithm when we were searching for a type of supernova,” study lead author Philip Wiseman (opens in new tab) , an astronomer at the University of Southampton in the U.K., said in a statement (opens in new tab) . “Most supernovae and tidal disruption events [bright flashes that occur when black holes tear apart wandering stars] only last for a couple of months before fading away. For something to be bright for two plus years was immediately very unusual.”

Related: James Webb Space Telescope discovers oldest black hole in the universe — a cosmic monster 10 million times heavier than the sun

The cause of the mysterious explosion is unclear, but astronomers think it’s most likely the result of a gigantic cloud of hydrogen gas thousands of times larger than our sun being gobbled up by a supermassive black hole. 

As chunks of the cloud are swallowed, shockwaves travel across the remaining hot gas, producing a giant explosion whose light has been bombarding Earth for more than two years and is yet to die out. By using two telescope systems designed for full-sky surveys — the Zwicky Transient Facility in California and the Asteroid Terrestrial-impact Last Alert System (ATLAS) in Hawaii — the researchers detected the distant event’s bright, flashing light.

Black holes are born from the collapse of giant stars and grow by gorging on gas, dust, stars and other black holes. For some of these gluttonous space-time ruptures, friction causes the material spiraling into their maws to heat up and emit light that can be detected by telescopes — turning them into so-called active galactic nuclei (AGN). 

The most extreme AGN are quasars — supermassive black holes billions of times heavier than the sun that shed their gaseous cocoons with light blasts trillions of times more luminous than the brightest stars. RELATED STORIES—’Green Monster’ supernova is the youngest in the Milky Way, James Webb telescope reveals

—Black holes may be swallowing invisible matter that slows the movement of stars

—What’s the biggest black hole in the universe?

Yet despite having a brightness on the scale of a quasar, the explosion is too short-lived to be one.

“With a quasar, we see the brightness flickering up and down over time. But looking back over a decade there was no detection of AT2021lwx, then suddenly it appears with the brightness of the brightest things in the universe, which is unprecedented,” co-author Mark Sullivan (opens in new tab) , a professor of astronomy at the University of Southampton, said in the statement. This means the explosion is likely to be from a gas cloud that was initially safely orbiting the black hole but got knocked off course to be sucked into the cosmic monster’s maw.

To confirm the identity of the object causing the explosion, the researchers are now studying the explosion in more detail by scanning across wavelengths. This could reveal its surface shape, temperature and the mysterious processes that are generating the bright light.

The researchers published their findings May 11 in the journal Monthly Notices of the Royal Astronomical Society (opens in new tab) .

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UK restores diplomatic ties with Syria

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UK restores diplomatic ties with Syria

The UK has re-established diplomatic ties with Syria, David Lammy has said, as he made the first visit to the country by a British minister for 14 years.

The foreign secretary visited Damascus and met with interim president Ahmed al Sharaa, also the leader of the rebel group Hayat Tahrir al-Sham (HTS), and foreign minister Asaad al Shaibani.

It marks the latest diplomatic move since Bashar al Assad’s regime was toppled by rebel groups led by HTS in December.

In a statement, Mr Lammy said a “stable Syria is in the UK’s interests” and added: “I’ve seen first-hand the remarkable progress Syrians have made in rebuilding their lives and their country.

“After over a decade of conflict, there is renewed hope for the Syrian people.

“The UK is re-establishing diplomatic relations because it is in our interests to support the new government to deliver their commitment to build a stable, more secure and prosperous future for all Syrians.”

Foreign Secretary David Lammy shakes hands with Syrian interim president Ahmed al-Sharaa in Damascus. Pic: X / @DavidLammy
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Foreign Secretary David Lammy with Syria’s interim president Ahmed al Sharaa in Damascus. Pic: X / @DavidLammy

The Foreign, Commonwealth and Development Office has also announced a £94.5m support package for urgent humanitarian aid and to support the country’s long-term recovery, after a number of British sanctions against the country were lifted in April.

While HTS is still classified as a proscribed terror group, Sir Keir Starmer said last year that it could be removed from the list.

The Syrian president’s office also said on Saturday that the president and Mr Lammy discussed co-operation, as well as the latest developments in the Middle East.

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Since Assad fled Syria in December, a transitional government headed by Mr al Sharaa was announced in March and a number of western countries have restored ties.

In May, US President Donald Trump said the United States would lift long-standing sanctions on Syria and normalise relations during a speech at the US-Saudi investment conference.

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From May: Trump says US will end sanctions for Syria

He said he wanted to give the country “a chance at peace” and added: “There is a new government that will hopefully succeed.

“I say good luck, Syria. Show us something special.”

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Defiance in Tehran as Khamenei makes appearance

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Defiance in Tehran as Khamenei makes appearance

They rose to their feet in ecstatic surprise, shouting “heydar, heydar” – a Shia victory chant.

This was the first public appearance of their supreme leader since Israel began attacking their country.

He emerged during evening prayers in his private compound. He said nothing but looked stern and resolute as he waved to the crowd.

He has spent the last weeks sequestered in a bunker, it is assumed, for his safety following numerous death threats from Israel and the US.

His re-emergence suggests a return to normality and a sense of defiance that we have witnessed here on the streets of Tehran too.

Earlier, we had filmed as men in black marched through the streets of the capital to the sound of mournful chants and the slow beat of drums, whipping their backs with metal flails.

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Defiance on streets of Tehran

This weekend they mark the Shia festival of Ashura as they have for 14 centuries. But this year has poignant significance for Iranians far more than most.

The devout remember the betrayal and death of Imam Hussein as if it happened yesterday. We filmed men and women weeping as they worshipped at the Imamzadeh Saleh Shrine in northern Tehran.

The armies of the Caliph Yazid killed the grandson of the Prophet Muhammad in the seventh-century Battle of Karbala.

Shiite Muslims mark the anniversary every year and reflect on the virtue it celebrates, of resistance against oppression and injustice.

But more so than ever in the wake of Israel and America’s attacks on their country.

The story is one of prevailing over adversity and deception. A sense of betrayal is keenly felt here among people and officials.

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Many Iranians believe they were lured into pursuing diplomacy as part of a ruse by the US.

Iran believed it was making diplomatic progress in talks with America it hoped could lead to a deal. Then Israel launched its attacks and, instead of condemning them, the US joined in.

Death to Israel chants resounded outside the mosque in skies which were filled for 12 days with the sounds of Israeli jets. There is a renewed sense of defiance here.

One man told us: “The lesson to be learned from Hussein is not to give in to oppression even if it is the most powerful force in the world.”

A woman was dismissive about the US president. “I don’t think about Trump, nobody likes him. He always wants to attack too many countries.”

Pictures on billboards nearby draw a line between Imam Hussein’s story and current events. The seventh-century imam on horseback alongside images of modern missiles and drones from the present day.

Other huge signs remember the dead. Iran says almost 1,000 people were killed in the strikes, many of them women and children.

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Officially Iran is projecting defiance but not closing the door to diplomacy.

Government spokeswoman Dr Fatemeh Mohajerani told Sky News that Israel should not even think about attacking again.

“We are very strong in defence and as state officials have announced, this time Israel will receive an even stronger response compared to previous times,” she said.

“We hope that Israel will not make such a mistake.”

But there is also a hint of conciliation: Senior Iranian officials have told Sky News that back-channel efforts are under way to explore new talks with the US.

Israel had hoped its attacks could topple the Iranian leadership. That proved unfounded, the government is in control here.

For many Iranians, it seems quite the opposite happened – the 12-day war has brought them closer together.

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Politics

Secret Service seizes $400M in crypto, cold wallet among world’s largest

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Secret Service seizes 0M in crypto, cold wallet among world’s largest

Secret Service seizes 0M in crypto, cold wallet among world’s largest

Secret Service quietly amasses one of the world’s largest crypto cold wallets with $400 million seized, exposing scams through blockchain sleuthing and VPN missteps.

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