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
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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) .
When the chancellor stands up and delivers her much-anticipated speech on Wednesday – with all sorts of exciting schemes for new infrastructure and growth-friendly reforms – she will cast it as part of the new government’s long-standing economic strategy.
Having begun the job of repairing the public finances in last October’s budget, this is, Rachel Reeves will say, simply the next step.
Regardless of whether you believe that this is all business-as-usual, it’s hard to escape the fact that the backdrop to the chancellor’s growth speech is, to say the least, challenging.
The economy has flatlined at best (possibly even shrunk) since Labour took power. Business and consumer confidence have dipped. Not all of this is down to the miserable messaging emanating from Downing Street since July, but some of it is.
Still, whether or not this constitutes a change, most businesses would welcome her enthusiasm for business-friendly reforms. And most would agree that making it easier to build infrastructure (which is a large part of her pitch) will help improve growth.
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1:00
Reeves risks economic ‘doom loop’
But it’s not everything. What about the fact that the UK has the highest energy costs in the developed world? What about the fact that these costs are likely to be pushed higher by net zero policies (even if they eventually come down)? What about the fact that tax levels are about to hit the highest level in history, or that government debt levels are now rising even faster than previously expected.
None of that is especially growth-friendly.
The greatest challenge facing the chancellor, however, is the fact that very little of what she’s talking about in her speech is actually new. Most of these schemes, from the Oxford-Cambridge Arc (or whatever they’re calling it) to the multiple new runways planned around London, are very, very old. They’ve been blueprints for years if not decades. What’s been missing is the political will and determination to turn them into reality.
The new government may fare better at delivery. But it won’t be easy. And none of these projects will deliver growth immediately. Not until some time after the end of the parliament will they properly bear fruit.
Rachel Reeves will unveil Labour’s plans to grow the UK economy on Wednesday, warning it “will not come without a fight”.
The chancellor is expected to announce a raft of measures including developing Oxford and Cambridge – which she says has the “potential to be Europe’s Silicon Valley” – building nine new reservoirs and the redevelopment of Old Trafford.
The speech is considered a key moment for a chancellor who has struggled with sluggish economic headwinds since her first budget last autumn.
Despite intense speculation, the government has not yet announced whether they will back a third runway at Heathrow, or further developments at other airports.
• Support for the Oxford-Cambridge Growth Corridor – also known as the Oxbridge Arc – that was scrapped by the Conservatives in 2022. The government points to a report claiming the development, including transport, business growth, and housing, could add £78bn to the UK economy by 2035;
• An agreement that allows water companies to spend £7.9bn to build nine new reservoirs, with two planned for Somerset and then one each in Lincolnshire, Hampshire, Cambridgeshire, Oxfordshire, Suffolk, Kent and West Midlands. A new reservoir hasn’t been opened in the UK since 1992;
• The government will back the redevelopment of Manchester United’s Old Trafford stadium and its surrounding area, alongside plans to change the way projects are appraised and evaluated, in order to “support decisions on public investment across the country, including outside London and the southeast”;
• Confirmation of a new approach to the National Wealth Fund and Office for Investment to get regional development happening faster.
When the chancellor stands up and delivers her much-anticipated speech on Wednesday – with all sorts of exciting schemes for new infrastructure and growth-friendly reforms – she will cast it as part of the new government’s long-standing economic strategy.
Regardless of whether you believe that this is all business-as-usual, it’s hard to escape the fact that the backdrop to the chancellor’s growth speech is, to say the least, challenging. The economy has flatlined at best (possibly even shrunk) since Labour took power. Business and consumer confidence have dipped. Not all of this is down to the miserable messaging emanating from Downing Street since July, but some of it is.
Still, whether or not this constitutes a change, most businesses would welcome the chancellor’s enthusiasm for business-friendly reforms.
But it’s not everything. What about the fact that the UK has the highest energy costs in the developed world? What about the fact that these costs are likely to be pushed higher by net zero policies (even if they eventually come down)? What about the fact that tax levels are about to hit the highest level in history, or that government debt levels are now rising even faster than previously expected.
Ms Reeves will use these plans as demonstrations of the government’s commitment to “growth”.
The chancellor is set to say in her speech: “Low growth is not our destiny. But growth will not come without a fight. Without a government that is on the side of working people. Willing to take the right decisions now to change our country’s course for the better.
“That’s what our Plan for Change is about. That is what drives me as chancellor. And it is what I’m determined to deliver.”
In its election campaign last year, Labour pledged to increase building in the UK – both housing and infrastructure.
These pledges are essential to the government’s plans to grow the economy, which has continued to struggle since Ms Reeves’ budget.
A key date for the chancellor is 26 March, when the Office for Budget Responsibility will provide its latest forecast, an indicator of whether they think the government’s plans will work.
A lack of growth could lead to Ms Reeves having to cut budgets further or raise taxes.
As part of the government’s plans to grow the economy and build, Sir Keir Starmer has vowed to “take on” people who oppose building near where they live, who are known as Nimbys – which stands for Not In My Backyard.
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PM: ‘Growth number one priority’
The Oxbridge arc
The chancellor will also announce that the Environment Agency has dropped its opposition to 4,500 houses around Cambridge after working with the regulator and local authorities.
The prime minister was clear last week that he also wants to see fewer legal challenges to planning applications.
Other developments in that region that are getting government backing include more funding for East-West Rail, with new services between Oxford and Milton Keynes, and upgrades to the roads linking Milton Keynes and Cambridge.
Ms Reeves will also say a new East Coast Mainline Station at Tempsford – between Cambridge and Milton Keynes – will be supported.
Sir Patrick Vallance, a science minister who came to prominence during COVID as the government’s chief scientific adviser, will be made the Oxford-Cambridge growth corridor champion.
Ms Reeves is set to say: “Just 66 miles apart, these cities are home to two of the best universities in the world, two of the most intensive innovation clusters in the world, and the area is a hub for globally renowned science and technology firms in life sciences, manufacturing, and AI.
“It has the potential to be Europe’s Silicon Valley. The home of British innovation.”
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When the chancellor stands up and delivers her much-anticipated speech on Wednesday – with all sorts of exciting schemes for new infrastructure and growth-friendly reforms – she will cast it as part of the new government’s long-standing economic strategy.
Having begun the job of repairing the public finances in last October’s budget, this is, Rachel Reeves will say, simply the next step.
Regardless of whether you believe that this is all business-as-usual, it’s hard to escape the fact that the backdrop to the chancellor’s growth speech is, to say the least, challenging.
The economy has flatlined at best (possibly even shrunk) since Labour took power. Business and consumer confidence have dipped. Not all of this is down to the miserable messaging emanating from Downing Street since July, but some of it is.
Still, whether or not this constitutes a change, most businesses would welcome her enthusiasm for business-friendly reforms. And most would agree that making it easier to build infrastructure (which is a large part of her pitch) will help improve growth.
Please use Chrome browser for a more accessible video player
1:00
Reeves risks economic ‘doom loop’
But it’s not everything. What about the fact that the UK has the highest energy costs in the developed world? What about the fact that these costs are likely to be pushed higher by net zero policies (even if they eventually come down)? What about the fact that tax levels are about to hit the highest level in history, or that government debt levels are now rising even faster than previously expected.
None of that is especially growth-friendly.
The greatest challenge facing the chancellor, however, is the fact that very little of what she’s talking about in her speech is actually new. Most of these schemes, from the Oxford-Cambridge Arc (or whatever they’re calling it) to the multiple new runways planned around London, are very, very old. They’ve been blueprints for years if not decades. What’s been missing is the political will and determination to turn them into reality.
The new government may fare better at delivery. But it won’t be easy. And none of these projects will deliver growth immediately. Not until some time after the end of the parliament will they properly bear fruit.