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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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Follow live: Mariners, Tigers open ALDS in Seattle

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Another Hernandez HR lifts Dodgers over Phillies

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Another Hernandez HR lifts Dodgers over Phillies

PHILADELPHIA — Teoscar Hernandez rallied the Los Angeles Dodgers with a three-run homer in the seventh inning that bailed out Shohei Ohtani, both on the mound and at the plate, and led his club to a 5-3 victory over the Philadelphia Phillies in Game 1 of their National League Division Series on Saturday night.

Ohtani struck out four straight times at the plate, the final time in the seventh with no outs and two runners on against Matt Strahm.

No worries, at least for the reigning World Series champions.

Following a Mookie Betts popout, Hernandez, who hit two homers in the wild card round, silenced a roaring Phillies crowd with an opposite-field drive to right off Strahm for a 5-3 lead. The veteran slugger gestured in wild celebration in his trot around the bases.

His hat off, Ohtani rose from his dugout seat to join in the fun, and exhale once he was on track for the win.

A three-time MVP, Ohtani recovered from a three-run second in his first career playoff pitching start to shut down the Phillies and finish with nine strikeouts over six innings.

Alex Vesia retired pinch-hitter Edmundo Sosa with the bases loaded in the eighth to preserve the lead. Roki Sasaki worked the ninth for his first career save.

Ohtani had admitted to nerves about playing in front of a crowd that voraciously tried to live up to its four hours of hell moniker — he was jeered as he stepped on the field during warmups — and he never found his footing at the plate.

Ohtani walked in the ninth.

Phillies starter Cristopher Sanchez struck out Ohtani three times, included a called strike three in the fifth inning that sent a towel-waving crowd into delirium.

Sanchez was even fired up on that one, and punched his fist in the air as he left the mound.

The Oh-4 became but a mere footnote — though Ohtani is the first player to strike out four times as a batter and strike out nine batters as a pitcher in the same postseason game — in an exhilarating comeback for a Dodgers team riding high after thumping the Reds in two games in the Wild Card Series.

Game 2 is Monday in Philadelphia.

Sanchez was thrust into the ace role when Zack Wheeler was ruled out for the season in August with complications from a blood clot. Wheeler was in full uniform and received a roaring ovation in the pregame introductions.

Sanchez pitched early like a No. 1 starter. He fanned Ohtani on three pitches to start the game and breezed through five scoreless innings.

Kike Hernandez chased Sanchez in the sixth when he ripped a two-out, two-run double down the left-field line that made it 3-2. David Robertson retired pinch-hitter Max Muncy to end the threat.

Robertson, the 40-year-old late-season pickup, allowed a single and hit Will Smith with a pitch to open the seventh before yielding to Strahm.

While disaster struck late for the Phillies bullpen, Vesia saved Tyler Glasnow in the eighth. Glasnow, pitching out of the bullpen in a short series, loaded the bases before he got the hook. Vesia got Sosa, who hit three home runs in a game last month, to fly out to center field.

The Phillies had only two hits after they scored three times in the third on J.T. Realmuto‘s two-run triple and Harrison Bader‘s sacrifice fly.

Jesus Luzardo will start for the Phillies on Monday in Game 2. Luzardo went 15-7 with a 3.92 ERA with a career-high 216 strikeouts in his first season with the Phillies after he was acquired from the Miami Marlins in an offseason trade. The Dodgers already had announced that two-time Cy Young Award winner Blake Snell was expected to start Game 2, with Yoshinobu Yamamoto on the bump in Game 3.

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Vlad Jr.’s playoff breakout fuels Jays past Yanks

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Vlad Jr.'s playoff breakout fuels Jays past Yanks

TORONTO — Vladimir Guerrero Jr.’s playoff career before Saturday was not befitting a $500 million franchise cornerstone. The Toronto Blue Jays first baseman managed just three hits in 25 plate appearances and didn’t hit a ball over the fence across six games. More important, the six games, split into two-game slices over three postseasons, were all Blue Jays losses.

That all flipped in a 10-1 win over the Yankees, the franchise he has long openly despised, in Game 1 of the American League Division Series on Saturday.

Starring in front of a raucous Rogers Centre crowd hungry for playoff baseball, Guerrero delivered an all-around clinic in the Blue Jays’ first playoff win since Game 4 of the 2016 AL Championship Series with a diving catch and three hits to fuel an offensive explosion.

“He’s the face of our franchise and a big reason why we go, a big part of why we’re here,” Blue Jays starter Kevin Gausman said. “So it’s been nice to see him have the night that he had.”

At the plate, Guerrero swatted his first career postseason home run and finished 3-for-4 with two RBIs and a run scored to fuel an offense that pounded 14 hits, including three home runs and three doubles. Defensively, his diving catch of Ryan McMahon‘s lineout at first base — while a bat shard whizzed by him — initiated an inning-ending double play in the second.

Blue Jays catcher Alejandro Kirk complemented Guerrero’s effort with his first two career postseason home runs. Right fielder Nathan Lukes contributed two hits, including a two-run double, with three RBIs and a diving catch down the right-field line. Shortstop Andres Gimenez went 2-for-4 as the Blue Jays chased Luis Gil after 2⅔ innings and forced the Yankees to use six pitchers.

“I think having him get the scoring going, the double play at first with McMahon, it’s nice,” Blue Jays manager John Schneider said of Guerrero. “It gives you a little bit of a jolt because it’s Vlad and what he means to this team.”

Guerrero did not waste time in providing that energy, swatting a 90 mph changeup from Gil in the first inning to give the Blue Jays a lead they wouldn’t relinquish. He added singles in the second and eighth innings and a sacrifice fly in the Blue Jays’ game-busting four-run seventh, igniting the sellout crowd on a gorgeous day in Ontario with the building’s roof open.

That it happened against the Yankees was fitting. Guerrero’s dislike of the Yankees, he has said, dates back to two incidents over two decades ago: the Yankees pulling a contract offer for his father, a Hall of Fame outfielder, in 2003 and Yankee Stadium security telling his father to take him off the field when he was a boy.

“For me, I bring the same energy every game regardless who I’m playing, especially now in the playoffs,” Guerrero said. “That’s all I’ve got on my mind is to go out there and play hard.”

Whatever his motivation, the five-time All-Star has enjoyed facing the Yankees during his seven-year career. Entering Saturday’s matchup — the first ever between the two clubs in the postseason — Guerrero was batting .302 with 22 home runs and an 0.918 OPS in 102 career games opposite the Yankees.

He improved those gaudy numbers Saturday, adding another highlight reel to a year that began with him committing to Toronto with a 14-year, $500 million contract extension in April and that he hopes ends with the franchise’s first championship since 1993 later this month.

“For me, my goal always is to win a World Series, to bring the World Series here,” Guerrero said. “My father, he never had the chance to win a World Series. That’s one of my goals, always been one of my goals, to do that for me, for him.”

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