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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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How quantum could supercharge Google’s AI ambitions

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How quantum could supercharge Google’s AI ambitions

Inside a secretive set of buildings in Santa Barbara, California, scientists at Alphabet are working on one of the company’s most ambitious bets yet. They’re attempting to develop the world’s most advanced quantum computers.

“In the future, quantum and AI, they could really complement each other back and forth,” said Julian Kelly, director of hardware at Google Quantum AI.

Google has been viewed by many as late to the generative AI boom, because OpenAI broke into the mainstream first with ChatGPT in late 2022.

Late last year, Google made clear that it wouldn’t be caught on the backfoot again. The company unveiled a breakthrough quantum computing chip called Willow, which it says can solve a benchmark problem unimaginably faster than what’s possible with a classical computer, and demonstrated that adding more quantum bits to the chip reduced errors exponentially. 

“That’s a milestone for the field,” said John Preskill, director of the Caltech Institute for Quantum Information and Matter. “We’ve been wanting to see that for quite a while.”

Willow may now give Google a chance to take the lead in the next technological era. It also could be a way to turn research into a commercial opportunity, especially as AI hits a data wall. Leading AI models are running out of high-quality data to train on after already scraping much of the data on the internet.

“One of the potential applications that you can think of for a quantum computer is generating new and novel data,” said Kelly. 

He uses the example of AlphaFold, an AI model developed by Google DeepMind that helps scientists study protein structures. Its creators won the 2024 Nobel Prize in Chemistry. 

“[AlphaFold] trains on data that’s informed by quantum mechanics, but that’s actually not that common,” said Kelly. “So a thing that a quantum computer could do is generate data that AI could then be trained on in order to give it a little more information about how quantum mechanics works.” 

Kelly has said that he believes Google is only about five years away from a breakout, practical application that can only be solved on a quantum computer. But for Google to win the next big platform shift, it would have to turn a breakthrough into a business. 

Watch the video to learn more.

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Tesla (TSLA) brand damage is destroying used car value: ‘People don’t want them anymore’

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Tesla (TSLA) brand damage is destroying used car value: 'People don't want them anymore'

Tesla’s brand damage is eroding the value of used Tesla vehicles at a rapid rate, as owners rush to sell theirs.

It is breaking the used Tesla market as prices are plunging just as the broader used car market is recovering.

After a few tough years for the used car market following the pandemic, it is finally starting to recover over the last month.

Economic uncertainty and a fear of higher inflation due to Trump’s tariffs are prompting some buyers to shift from the new car market to the used car market.

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From March 2024 to March 2025, average used car prices decreased by 2.68% in the US, but the trend has finally reversed.

According to Car Guru‘s used car index, used car prices have risen an impressive 2.17% in the last 30 days alone.

However, there’s an exception: Tesla.

The price of used Tesla vehicles has been falling, like the rest of the used car market, since the pandemic; however, it is not benefiting from the reversal in the current macroeconomic situation.

While average used car prices rose more than 2% in the last 30 days, Tesla’s used car prices decreased by 1.34% in the US.

That’s due to oversupply, as many Tesla owners are selling their vehicles to distance themselves from the Tesla brand, which is associated with CEO Elon Musk and his increasingly divisive political views.

The demand to sell used Tesla vehicles is so high that many used car dealers, who had been fighting to acquire inventory just a year prior, are starting to be reticent about buying Tesla vehicles as the value decreases so rapidly.

In Quebec, Le Journal de Montréal spoke with local used car dealers and attended a car auction where many Tesla vehicles were up for sale, with some selling for half the price they were selling for just over a year ago.

Éric Piuze, owner of a used car dealership on Montreal’s South Shore, said (translated from French):

“People don’t want them anymore. The Elon Musk effect is very real in Quebec.”

The used car dealers at the auction noted that they are not confident they can sell the used Tesla quickly enough to avoid further value decreases.

Furthermore, they note that potential buyers are lowballing on Tesla vehicles because they are aware that inventory is high, creating a buyer’s market.

Dealers are also seeing higher defaults on Tesla car payments, as buyers who took on debt to purchase them just a few years ago struggle to make payments.

Piuze added (translated from French):

People paid a lot of money for Teslas. During the pandemic, we saw many people remortgaging their homes to buy a Tesla. Those days are over.

At its peak, the average used Tesla price was over $60,000 in 2022. Now, the same vehicles are worth a fraction, but their car payments are still high.

Electrek’s Take

Even with the used car market finally getting a breather from crashing prices, Tesla vehicles are not benefiting at all. This highlights a significant issue in the used Tesla market. It’s broken.

The market can’t absorb the surge in people selling their Tesla vehicles.

I wouldn’t want to be a company holding a fleet of Tesla vehicles right now. The value erosion is impressive.

I thought that maybe the Cybertruck was dragging the entire Tesla market down, with a 6.64% decrease in used value over the last 30 days. However, the Model Y alone saw a 1.67% decrease during the same period.

The good news is that the vast majority of people selling their used Tesla vehicles are purchasing other electric vehicles, thereby boosting the EV market. It’s also giving people the chance to get into Tesla vehicles for cheaper, although they should expect the value of those vehicles to decrease rapidly.

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Nintendo Switch 2 retail preorder to begin April 24 following tariff delays

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Nintendo Switch 2 retail preorder to begin April 24 following tariff delays

An attendee wearing a Super Mario costume uses a Nintendo Switch 2 game console while playing a video game during the Nintendo Switch 2 Experience at the ExCeL London international exhibition and convention centre in London, Britain, April 11, 2025. 

Isabel Infantes | Reuters

Nintendo on Friday announced that retail preorder for its Nintendo Switch 2 gaming system will begin on April 24 starting at $449.99.

Preorders for the hotly anticipated console were initially slated for April 9, but Nintendo delayed the date to assess the impact of the far-reaching, aggressive “reciprocal” tariffs that President Donald Trump announced earlier this month.

Most electronics companies, including Nintendo, manufacture their products in Asia. Nintendo’s Switch 1 consoles were made in China and Vietnam, Reuters reported in 2019. Trump has imposed a 145% tariff rate on China and a 10% rate on Vietnam. The latter is down from 46%, after he instituted a 90-day pause to allow for negotiations.

Nintendo said Friday that the Switch 2 will cost $449.99 in the U.S., which is the same price the company first announced on April 2.

“We apologize for the retail pre-order delay, and hope this reduces some of the uncertainty our consumers may be experiencing,” Nintendo said in a statement. “We thank our customers for their patience, and we share their excitement to experience Nintendo Switch 2 starting June 5, 2025.”

The Nintendo Switch 2 and “Mario Kart World bundle will cost $499.99, the digital version “Mario Kart World” will cost $79.99 and the digital version of “Donkey Kong Bananza” will cost $69.99, Nintendo said. All of those prices remain unchanged from the company’s initial announcement.

However, accessories for the Nintendo Switch 2 will “experience price adjustments,” the company said, and other future changes in costs are possible for “any Nintendo product.”

It will cost gamers $10 more to by the dock set, $1 more to buy the controller strap and $5 more to buy most other accessories, for instance.

WATCH: Nintendo has ‘a lot of work to do’ to convince casual users to upgrade to Switch 2: Kantan Games

Nintendo has 'a lot of work to do' to convince casual users to upgrade to Switch 2: Kantan Games

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