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Astronomers have spotted a runaway supermassive black hole, seemingly ejected from its home galaxy and racing through space with a chain of stars trailing in its wake. 

According to the team’s research, which was published April 6 in The Astrophysical Journal Letters (opens in new tab) , the discovery offers the first observational evidence that supermassive black holes can be ejected from their home galaxies to roam interstellar space.

The researchers discovered the runaway black hole as a bright streak of light while they were using the Hubble Space Telescope to observe the dwarf galaxy RCP 28, located about 7.5 billion light-years from Earth. 

A five-step schematic showing two black holes in a binary partnership before a third black hole intrudes, upsetting the balance at the galaxy’s center and sending one of the black holes careening into intergalactic space. Panel 6 shows the gassy trail observed in the new study. (Image credit: van Dokkum et al.)

Follow-up observations showed that the streak measures more than 200,000 light-years long — roughly twice the width of the Milky Way — and is thought to be made of compressed gas that is actively forming stars. The gas trails a black hole that is estimated to measure 20 million times the mass of the sun and is speeding away from its home galaxy at 3.5 million mph (5.6 million km/h), or roughly 4,500 times the speed of sound. This is fast enough to travel from Earth to the moon in about 14 minutes, according to a NASA statement (opens in new tab) .

According to the researchers, the streak points right to the center of a galaxy, where a supermassive black hole would normally sit.

“We found a thin line in a Hubble image that is pointing to the center of a galaxy,” lead study author Pieter van Dokkum (opens in new tab) , a professor of physics and astronomy at Yale University, told Live Science. “Using the Keck telescope in Hawaii, we found that the line and the galaxy are connected. From a detailed analysis of the feature, we inferred that we are seeing a very massive black hole that was ejected from the galaxy, leaving a trail of gas and newly formed stars in its wake.” 

A Hubble Space Telescope image revealing the ‘runaway black hole’ being trailed by a vast bridge of stars. Nothing like this has ever been seen in space before, NASA said. (Image credit: NASA, ESA, Pieter van Dokkum (Yale); Image Processing: Joseph DePasquale (STScI)) Confirming the tail of an ejected black hole

Most, if not all, large galaxies host supermassive black holes at their centers. Active supermassive black holes often launch jets of material at high speeds, which can be seen as streaks of light that superficially resemble the one the researchers spotted. These are called astrophysical jets.

To determine this isn’t what they observed, van Dokkum and the team investigated this streak and found it didn’t possess any of the telltale signs of an astrophysical jet. While astrophysical jets grow weaker as they move away from their source of emission, the potential supermassive black hole tail actually gets stronger as it progresses away from what seems to be its galactic point of origin, according to the researchers. Also, astrophysical jets launched by black holes fan out from their source, whereas this trail seems to have remained linear.

The team concluded that the explanation that best fits the streak is a supermassive black hole blasting through the gas that surrounds its galaxy while compressing that gas enough to trigger star formation in its wake. 

“If confirmed, it would be the first time that we have clear evidence that supermassive black holes can escape from galaxies,” van Dokkum said.Black holes on the move

Once the runaway supermassive black hole is confirmed, the next question that astronomers need to answer is how such a monstrous object gets ejected from its host galaxy.

“The most likely scenario that explains everything we’ve seen is a slingshot, caused by a three-body interaction,” van Dokkum said. “When three similar-mass bodies gravitationally interact, the interaction does not lead to a stable configuration but usually to the formation of a binary and the ejection of the third body.”Related stories—8 ways we know that black holes really do exist

—9 ideas about black holes that will blow your mind

—The 10 most massive black hole findings from 2022

This might mean that the runaway black hole was once part of a rare supermassive black hole binary, and during a galactic merger, a third supermassive black hole was introduced to this partnership, flinging out one of its occupants. 

Astronomers aren’t sure how common these massive runaways are.

“Ejected supermassive black holes had been predicted for 50 years but none have been unambiguously seen,” van Dokkum said “Most theorists think that there should be many out there.”

Further observations with other telescopes are needed to find direct evidence of a black hole at the mysterious streak’s tip, van Dokkum added. 

Editor’s note: This article was updated on April 10 to reflect that the study has now been published in the peer-reviewed Astrophysical Journal Letters. Several new images were also added, coutesy of a NASA news release.

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BlockFi bankruptcy administrator and DOJ agree to dismiss $35M lawsuit

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BlockFi bankruptcy administrator and DOJ agree to dismiss M lawsuit

BlockFi bankruptcy administrator and DOJ agree to dismiss M lawsuit

BlockFi’s bankruptcy administrator and the DOJ have settled a $35 million crypto asset transfer lawsuit.

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Hard-throwing rookie Misiorowski going to ASG

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Hard-throwing rookie Misiorowski going to ASG

Hard-throwing rookie Jacob Misiorowski is a National League All-Star replacement, giving the Milwaukee Brewers right-hander a chance to break Paul Skenes‘ record for the fewest big league appearances before playing in the Midsummer Classic.

Misiorowski was named Friday night to replace Chicago Cubs lefty Matthew Boyd, who will be unavailable for the All-Star Game on Tuesday night in Atlanta because he is scheduled to start Saturday at the New York Yankees.

The 23-year-old Misiorowski has made just five starts for the Brewers, going 4-1 with a 2.81 ERA while averaging 99.3 mph on his fastball, with 89 pitches that have reached 100 mph.

If he pitches at Truist Park, Misiorowski will make it consecutive years for a player to set the mark for fewest big league games before an All-Star showing.

Skenes, the Pittsburgh Pirates right-hander getting ready for his second All-Star appearance, had made 11 starts in the majors when he was chosen as the NL starter for last year’s All-Star Game at Texas. He pitched a scoreless inning.

“I’m speechless,” said a teary-eyed Misiorowski, who said he was given the news a few minutes before the Brewers’ 8-3 victory over Washington. “It’s awesome. It’s very unexpected and it’s an honor.”

Misiorowski is the 30th first-time All-Star and 16th replacement this year. There are now 80 total All-Stars.

“He’s impressive. He’s got some of the best stuff in the game right now, even though he’s a young pitcher,” said Yankees slugger Aaron Judge, who is a starting AL outfielder for his seventh All-Star nod. “He’s going to be a special pitcher in this game for a long time so I think he deserved it and it’s going be pretty cool for him and his family.”

Carlos Rodón, Carlos Estévez and Casey Mize were named replacement pitchers on the AL roster.

The New York Yankees‘ Rodón, an All-Star for the third time in five seasons, will replace teammate Max Fried for Tuesday’s game in Atlanta. Fried will be unavailable because he is scheduled to start Saturday against the Chicago Cubs.

In his final start before the All-Star game, Rodón allowed four hits and struck out eight in eight innings in an 11-0 victory over the Cubs.

“This one’s a little special for me,” said Rodón, an All-Star in 2021 and ’22 who was 3-8 in his first season with the Yankees two years ago before rebounding. “I wasn’t good when I first got here, and I just wanted to prove that I wasn’t to going to give up and just put my best foot forward and try to win as many games as I can.”

The Kansas City Royals‘ Estévez replaces Texas’ Jacob deGrom, who is scheduled to start at Houston on Saturday night. Estévez was a 2023 All-Star when he was with the Los Angeles Angels.

Mize takes the spot held by Boston‘s Garrett Crochet, who is scheduled to start Saturday against Tampa Bay. Mize gives the Tigers six All-Stars, most of any team and tied for the franchise record.

Royals third baseman Maikel Garcia will replace Tampa Bay‘s Brandon Lowe, who went on the injured list with left oblique tightness. The additions of Estévez and Garcia give the Royals four All-Stars, matching their 2024 total.

The Seattle Mariners announced center fielder Julio Rodríguez will not participate, and he was replaced by teammate Randy Arozarena. Rodríguez had been voted onto the AL roster via the players’ ballot. The Mariners, who have five All-Stars, said Rodríguez will use the break to “recuperate, rest and prepare for the second half.”

Arozarena is an All-Star for the second time. He started in left field for the AL two years ago, when he was with Tampa Bay. Arozarena was the runner-up to Vladimir Guerrero Jr. in the 2023 Home Run Derby.

Rays right-hander Drew Rasmussen, a first-time All-Star, is replacing Angels left-hander Yusei Kikuchi, who is scheduled to start Saturday night at Arizona. Rasmussen is 7-5 with a 2.82 ERA in 18 starts.

San Diego added a third NL All-Star reliever in lefty Adrián Morejón, who replaces Philadelphia starter Zack Wheeler. The Phillies’ right-hander is scheduled to start at San Diego on Saturday night. Morejón entered the weekend with a 1.71 ERA in 45 appearances.

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M’s Raleigh hits 2 more HRs, brings total to 38

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M's Raleigh hits 2 more HRs, brings total to 38

DETROIT — Cal Raleigh hit his 37th and 38th home runs in Seattle‘s 12-3 victory over Detroit on Friday night to move within one of Barry Bonds’ 2001 major league record for homers before the All-Star break.

Raleigh hit a solo homer off former teammate Tyler Holton in the eighth to tie the American League record of 37 before the All-Star break set by Reggie Jackson in 1969 and matched by Chris Davis in 2013.

“[Holton] and I are really good friends, and I’ve caught a lot of his pitches,” said Raleigh, who was in the lineup as the designated hitter instead of at catcher. “I don’t think that helped much, but I’m sure he’s not very happy with me.”

Raleigh hit a grand slam off Brant Hurter in the ninth.

“I didn’t even know it was a record until just now,” Raleigh said. “I don’t have words for it, I guess. I’m just very grateful and thankful.”

It was Raleigh’s eighth multihomer game this season, tying Jackson (also in 1969) for the most such games before the All-Star break in MLB history, according to ESPN Research. He also tied Ken Griffey Jr. for the most multihomer games in Mariners franchise history.

Seattle has two games left in Detroit before the break.

“Cal Raleigh … this is just unbelievable,” Mariners manager Dan Wilson said. “He’s already set the AL record and now he’s only one short of Barry. There are two games, so who knows?”

Raleigh hit 10 homers in March and April, 12 in May, 11 in June and has five in July.

“This is a very boring comment, but baseball is all about consistency,” Wilson said. “This hasn’t been one hot streak, he’s doing this month after month. That says everything.”

The Associated Press contributed to this report.

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