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
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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.
A man suspected of killing 15 people during a shooting in Bondi Beach “conducted firearms training” with his father before the attack on a Jewish event, Australian police have said.
Naveed Akram, 24, and his father, Sajid Akram, allegedly attacked people at a Hanukkah event at Bondi Beach on 14 December, killing victims aged 10 to 87 and injuring 40 others.
Fifty-year-old Sajid Akram was killed by police at the scene, while Naveed was injured and treated in hospital. He has since been charged with 59 offences, including a terror charge, and police transferred him to a prison on Monday.
New South Wales Police have released pictures of Naveed Akram and his father holding guns, as they “conducted firearms training in a countryside location, suspected to be NSW” in late October, according to a police fact sheet seen by Sky News.
Image: Suspected gunman Sajid Akram during the alleged firearms training with his son. Pic: NSW Police/NSW Local Court
“The accused and his father are seen throughout the video firing shotguns and moving in a tactical manner,” police said.
‘Homemade bombs’
On the day of the Bondi Beach attack, the pair allegedly threw homemade bombs and improvised explosive devices (IEDs) at the crowd of people at the gathering near the beach, but these did not detonate.
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An analysis indicates that both were “viable” IEDs, according to the police file.
Image: The suspected gunmen were allegedly armed with pipe bombs. Pic: NSW Police/NSW Local Court
Image: Police said they found an IED in the suspects’ car. Pic: NSW Police/NSW Local Court
The information on the fact sheet was released after a suppression order was lifted by an NSW court.
Police allege the men had stored the explosives – three pipe bombs, one tennis ball bomb and one large IED – in a silver Hyundai vehicle, alongside two single-barrel shotguns, a Beretta rifle and two Islamic State flags.
The Hyundai was parked near the scene of the shooting, with the Islamic State flags allegedly displayed in the front and rear windows.
Image: A homemade Islamic State flag was also found in the car, police said. Pic: NSW Police/NSW Local Court
‘Justification’ video found
A phone belonging to Naveed Akram was also found in the car, on which officers identified several videos, including the alleged firearms training video.
Another video shows Naveed Akram and his father sitting in front of an image of an Islamic State flag, with four long-arm guns with rounds attached seen in the background, police said.
The men “appear to summarise their justification for the Bondi terrorist attack” in the footage, according to the fact sheet.
Image: Police said the men walked on the footbridge from where they allegedly shot at crowds two days later. Pic: NSW Local Court
Their Hyundai was previously seen on CCTV entering the car park at Bondi Beach before Naveed Akram and his father walked around the area at around 10pm on 12 December – two days before the shooting.
Police allege that this is evidence of reconnaissance and planning of a terrorist act.
On the day of the shooting, CCTV showed the men leaving a rental house in the nearby suburb of Campsie at around 3pm before driving to Bondi at around 5pm, police said.
The pair were seen carrying bulky items wrapped in blankets, which officers allege were the rifles and homemade bombs.
Terror on camera: The Bondi attack
In the room they rented throughout December, police said they later discovered a firearm scope, ammunition, a suspected IED, 3D-printed parts for a shotgun speed loader, a rifle, a shotgun, numerous firearms parts, bomb-making equipment and two copies of the Koran.
Police said Naveed Akram’s mother told officers that she believed her husband and son were on a fishing trip when they allegedly launched the attack. She said Naveed had been calling her every day from a public phone at around 10.30am.
New gun laws
Meanwhile, the NSW government announced new draft gun laws on Monday, which the state’s premier, Chris Minns, promised would be the toughest in Australia.
‘We’re still in a state of shock’
The new restrictions would include making Australian citizenship a condition of qualifying for a firearms licence.
But a law like this would have excluded Sajid Akram, who was an Indian citizen with a permanent resident visa for Australia.
He also legally owned six rifles and shotguns, which would be limited to a maximum of four guns under the new legal limit for recreational shooters.
This comes as Australia’s Prime Minister Anthony Albanese said on Monday that his government would introduce a new offence of adults trying to influence and radicalise children after already introducing legislation to criminalise hate speech and doxing.
The remaining 130 schoolchildren and staff abducted by gunmen from a Catholic school in Nigeria last month have been freed.
They are among more than 300 pupils and 12 staff taken from St Mary’s Catholic boarding school in Niger State on 21 November.
Fifty children managed to escape at the time, the Christian Association of Nigeria previously said, while the government said on 8 December that it had rescued 100 of those abducted.
Image: Belongings and clothes left behind at St Mary’s School after the kidnapping. Pic: Reuters
Now the last of the pupils have been released, a spokesman for President Bola Tinubu said, bringing a close to one of the country’s biggest mass kidnappings in recent years.
“The remaining 130 schoolchildren abducted by terrorists… have now been released,” wrote presidential spokesman Bayo Onanuga in a post on X.
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“They are expected to arrive in Minna on Monday and rejoin their parents for the Christmas celebration.
“The freedom of the schoolchildren followed a military-intelligence driven operation.”
The abduction has fuelled outrage over worsening insecurity in northern Nigeria, where armed gangs frequently target schools for ransom.
School kidnappings surged after Boko Haram militants abducted 276 girls from Chibok in 2014.
Over a decade later, dozens of the girls taken on that occasion remain missing.
A Baidu Apollo RT6 robotaxi during Baidu’s Apollo Day in Wuhan, China, on Wednesday, May 15, 2024.
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Chinese tech giant Baidu has announced plans to bring robotaxis to London starting next year through its partnerships with Lyft and Uber, as the UK emerges as a growing autonomous vehicle battleground.
The announced collaborations will bring Baidu’s Apollo Go autonomous vehicles to the British capital through the Uber and Lyft platforms, the companies said on their respective social media accounts.
Lyft’s testing of Baidu’s initial fleet of dozens of vehicles will begin in 2026, pending regulatory approval, “with plans to scale to hundreds from there,” Lyft CEO David Risher said in a post on social media platform X on Monday.
Meanwhile, Uber said that its first pilot is expected to start in the first half of 2026. “We’re excited to accelerate Britain’s leadership in the future of mobility, bringing another safe and reliable travel option to Londoners next year,” the company added.
The moves add to Baidu’s growing global footprint, which it says includes 22 cities and more than 250,000 weekly trips, as it races against other Chinese players like WeRide and Western giants like Alphabet‘s Waymo.
The UK, in particular, has seen a wave of interest from driverless taxi companies, following the government’s announcement in June that it would accelerate its plans to allow autonomous vehicle tech on public roads.
The government now aims to begin permitting robotaxis to operate in small-scale pilots starting in spring 2026, with Baidu likely aiming to be amongst the first.
The city of London has also established a “Vision Zero” goal to eliminate all serious injuries and deaths in its transportation systems by 2041, with autonomous driving technology expected to play a large role.
News of Baidu pilots comes as its competitor Waymo also looks to begin testing in London, with plans for a full service launch in 2026. Waymo currently operates or plans to launch a service or test its fleet in 26 markets, including major cities like Tokyo and New York City.
Baidu, for its part, has been aggressively expanding globally, with testing rolling out in international markets like the United Arab Emirates and Switzerland.