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.”
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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
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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) .
Later that night, the suspect, named as Edvard Smith, was believed to have fallen into the Thames from the Queen Elizabeth II Bridge which crosses the river at Dartford 17 miles away.
Image: Lisa Smith
Around that time, the suspect’s car containing a handgun was found abandoned on the bridge and a man was seen on the wrong side of the barrier.
About a week after the shooting, Kent Police said they believed Edvard Smith had died after falling into the water.
The force has now said a body was found in the Thames near Rainham in Essex on Friday afternoon. It has not been formally identified but the suspect’s family have been told of the development.
Edvard Smith was known to Ms Smith and there had been no prior contact between the police and the victim or suspect.
‘So much commotion’
Following the shooting, the landlady of The Three Horseshoes, Michelle Thomas, told Sky News she heard two loud bangs that she initially “thought were fireworks” on the night of the attack.
She said there was “so much commotion – screaming, shouting, crying” and the shooting had left the community in “absolute shock”.
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CCTV captures sound of gunshots near fatal shooting site
She said Ms Smith, from Slough, had been to the pub before, “mostly in the summer” but “wasn’t a regular”.
Ms Thomas also said about 30 people were at the pub for dinner, while 20 more were in the bar as the incident unfolded just after 7pm.
Kent Police said on Saturday: “A body has been recovered by police from the River Thames, which is being linked to a murder investigation in Knockholt.
“On Friday 14 February 2025, Lisa Smith, 43, was killed after she was shot outside a pub in Main Road. The suspect was known to Lisa and later that evening officers found his car abandoned on the Queen Elizabeth II Bridge. Enquiries established he had fallen into the water below.
“At around 3.45pm on Friday 7 March, a body was located near Rainham, Essex. Formal identification has not yet taken place; however, the man’s family have been informed.”
Parts of the UK are expected to be hotter than the Balearic Islands, Costa del Sol and the Amalfi Coast this weekend.
The country is set to reach the highest temperatures of the year so far, with central England heating up to 20C on Sunday.
Saturday is also set to reach temperatures in the high teens, with East Anglia, northwest England, the north Midlands and North Wales hitting 18-19C, the Met Office said.
Those temperatures are believed to be above average for this time of year.
Craig Snell, a meteorologist at the Met Office, said there are a “few exceptions” to the “fine and sunny” weekend weather, including areas in the far north of Scotland, but those areas will still be generally dry and sunny.
Image: A map showing warm fronts over the UK on Saturday
Meanwhile, popular holiday destinations in Europe are expected to record cooler temperatures.
A high of 15C is forecast this weekend for Marbella on the south coast of Spain, a maximum of 17C is expected in Ibiza, and 18C is forecast for Sorrento on Italy’s Amalfi Coast.
Image: People were out in force on Saturday, enjoying the warmer weather. Pic: PA
Image: Joggers run along the sea front in Southend-on-Sea, Essex.
Pic: PA
Sky News meteorologist Chris England said the warm weekend is not expected to last, with conditions “cooling off from the North on Sunday night and through Monday”.
Image: Colder fronts will start to move across the UK on Monday
Image: By Wednesday the UK will experience wintry showers and cold temperatures
A spell of rain will move south across the country early next week, bringing the return of a few wintry showers in the North and North East.
“While there is uncertainty in the extent of rain and wintry showers through the middle of next week, there is higher confidence that below average temperatures will continue through the week, bringing a very different feel to the mild weather over the weekend,” deputy chief meteorologist Chris Bulmer said.
Volodymyr Zelenskyy has thanked Ukraine’s allies for condemning Russian strikes after one of the deadliest days for civilians in his country so far this year.
Ukraine’s president described the attacks as a “vile and inhumane intimidation tactic” by Russia.
While a warning by Donald Trump to Vladimir Putin to stop “pounding” Ukraine or else, appears to have fallen on deaf ears.
The US has been piling pressure on President Zelenskyy’s government to cooperate in convening peace talks with Russia.
American aerospace company Maxar Technologies said on Friday it had disabled access to its satellite imagery for Kyiv. Its ability to strike inside Russia and defend itself from bombardment is very much diminished without such images.
At least 22 people were killed in multiple Russian attacks, including 11 in the frontline town of Dobropilla in Ukraine’s embattled eastern Donetsk region.
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Russian strike kills at least 11 in Ukraine
Russiafired two ballistic missiles into the town centre, then launched a strike targeting rescuers who responded, according to Mr Zelenskyy. Forty-seven people, including seven children, were injured in the attack.
“It is a vile and inhumane intimidation tactic to which the Russians often resort,” he said.
The president added: “It was one of the most brutal strikes, a combined one. The strike was deliberately calculated to cause maximum damage. Missiles, along with a Shahed drone, targeted the central part of the town.
“Nine residential buildings were hit. Also, the shopping centre and stores were struck.”
Image: People stand at the site of an apartment building hit by a Russian missile strike in Dobropillia. Pic: Reuters
Another seven people were killed in four towns close to the frontline where Russian troops have been making steady advances, said regional governor Vadym Filashkin.
Three others died when a Russian drone hit a civilian workshop in the northeastern Kharkiv region, emergency services reported. And one man was killed by shelling in the region.
The UN Human Rights Monitoring Mission in Ukraine said it was one of 2025’s deadliest attacks for Ukrainian civilians.
Image: Pic: Reuters
Some 24 hours earlier, Russia struck Ukrainian energy facilities using dozens of missiles and drones.
The attacks hampered Ukraine’s ability to supply power to its citizens and run weapons factories vital to its defences.
When asked on Friday if Russian President Vladimir Putin was taking advantage of the US pause on intelligence-sharing to attack Ukraine, Mr Trump responded: “I think he’s doing what anybody else would.”
Mr Zelenskyy did not mention intelligence-sharing on Saturday, but said he welcomed Mr Trump’s proposal to bring in banking sanctions and tariffs on Russia until a ceasefire and final peace settlement is reached.
Mr Zelenskyy also said: “I am grateful to all the leaders, all those diplomats of our partner countries, all public figures who support Ukraine, who have condemned these Russian strikes and who call all things by their proper names.
“And it is essential that we continue coordinating all our efforts with our partners to ensure that our defence works effectively and that we do everything to bring peace closer.”
Mr Zelenskyy has said he and other senior Ukrainian officials will go to Saudi Arabia next week to discuss proposals aimed at ending the war.
In a post on X, he wrote he was set to meet Saudi Arabia’s Crown Prince Mohammed bin Salman on Monday, and his team would remain in the country to have talks with US officials.