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One of physicist Stephen Hawking’s most famous paradoxes may finally be solved: Black holes may in fact hang onto information about the massive stars that created them, new research indicates. 

This information may lurk in the radiation around black holes – colloquially known as “quantum hair” – and could, in theory, be retrieved to retell the origins of those black holes, the research suggests. 

These findings, published March 6 in the journal Physics Letters B. (opens in new tab) , may finally resolve a thorny problem that Hawking was working on in his last years. 

Related: Stephen Hawking’s final book says there’s ‘no possibility’ of God in our universe

According to Hawking’s work, radiation slowly “leaks” out of black holes in the form of thermal energy, which has come to be known as “Hawking radiation.” But because of its thermal nature, this radiation can’t carry information. That means that as black holes evaporate, they methodically destroy all information about the stars that created them. This is contrary to the laws of quantum mechanics, which say that information cannot be destroyed and that an object’s final state can reveal clues about its initial state. This problem has troubled cosmologists for decades and is known as the “Hawking information paradox.” 

“[This research] is the final nail in the coffin for the paradox because we now understand the exact physical phenomenon by which information escapes a decaying black hole,” lead study author Xavier Calmet (opens in new tab) , a professor of physics at the University of Sussex, told Live Science via email. He suggests a modification to Hawking radiation that makes it “non-thermal” and thus capable of carrying information with it away from the final fate of the black hole. 

Physicist Stephen Hawking in his office in 1989. (Image credit: Jean-Regis Rouston/Roger Viollet via Getty Images) The black hole problem

Black holes are objects so massive that nothing can escape the pull of their gravity, not even light. They form when enormous stars run out of fuel and collapse in on themselves.

In classical physics, black holes are “very simple objects,” Calmet said. “So simple that they can be characterized by three numbers: their mass, angular momentum, and electric charge.”

Famous physicist John Wheeler described this lack of distinguishing characteristics by saying “black holes have no hair.” But, Calmet explained, while the final black hole is very simple, the original star that birthed it is a complex astrophysical object, consisting of a complicated amalgam of protons, electrons, and neutrons which come together to form the elements that build the chemical composition of that star. 

While black holes carry no “memory” of the stars they once were, the rules of quantum physics say that information can’t simply be erased from the universe. In 1976, Hawking introduced a fly to this cosmic ointment by showing this information couldn’t dwell indefinitely within black holes sealed away from the outside universe either. Applying the rules of quantum mechanics to black holes, Hawking suggested they emit a type of thermal radiation, later called Hawking radiation. Over immense periods of time, the leaking of this radiation causes black holes to completely evaporate, leaving only a vacuum behind. In this way, information is irretrievably lost.

“This is however not allowed by quantum physics, which posits that the movie of this black hole’s ‘life’ could be rewound,” Calmet said. “Starting from the radiation we should be able to rebuild the original black hole and then eventually the star.”Finding the black hole’s ‘hair’

Along with his colleague Steve Hsu (opens in new tab) , a professor of theoretical physics at Michigan State University, Calmet has been working since 2021 to crack Hawking’s paradox. In a previous study, published in March 2022, the team argued that black holes do indeed have “quantum hair,” in the form of a unique quantum imprint in the gravitational fields that surround them

In their new research, the team reassessed Hawking’s 1976 calculations, but this time accounted for the effects of “quantum gravity”  —  the description of gravity according to the principles of quantum mechanics  —  something Hawking hadn’t done. Related stories— The 12 Strangest Objects in the Universe

— The 18 Biggest Unsolved Mysteries in Physics 

— 11 Fascinating Facts About Our Milky Way Galaxy 

“While these quantum gravitational corrections are minuscule, they are crucial for black hole evaporation,” Calmet said. “We were able to show that these effects modify Hawking radiation in such a way that this radiation becomes non-thermal. In other words, factoring in quantum gravity the radiation can contain information.”

While the quantum hair suggested in Calmetand Hsu’s previous work was an abstract mathematical concept, the team has now identified the exact physical phenomenon by which information escapes the black hole via Hawking radiation, and how it could be retrieved by an outside observer. This is currently not possible, as it would require an instrument sensitive enough to measure Hawking radiation, which currently is purely theoretical. 

Currently there is no real way for astrophysicists to measure the effect the researchers propose, as it is minuscule, Calmet acknowledged. Instead, he suggests one way to progress this theory would be by studying simulations of black holes in labs on Earth. The team’s mathematical modeling of Hawking radiation and black holes could prove invaluable in these simulations. 

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Virginia Giuffre, who accused Prince Andrew of sexual assault, has died, her family says

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Virginia Giuffre, who accused Prince Andrew of sexual assault, has died, her family says

Virginia Giuffre, who accused Prince Andrew of sexual assault, has died aged 41.

In a statement to Sky’s US partner network NBC News on Friday, her family said she took her own life in the Perth suburb of Neergabby, Australia, where she had been living for several years.

“It is with utterly broken hearts that we announce that Virginia passed away last night at her farm in Western Australia,” her family said.

“She lost her life to suicide, after being a lifelong victim of sexual abuse and sex trafficking.

“Virginia was a fierce warrior in the fight against sexual abuse and sex trafficking. She was the light that lifted so many survivors.

“In the end, the toll of abuse is so heavy that it became unbearable for Virginia to handle its weight.”

FILE - Virginia Giuffre, center, holds a news conference outside a Manhattan court in New York, Aug. 27, 2019. (AP Photo/Bebeto Matthews, File)
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Pic: AP

Police said emergency services received reports of an unresponsive woman at a property in Neergabby on Friday night.

“Police and St John Western Australia attended and provided emergency first aid. Sadly, the 41-year-old woman was declared deceased at the scene,” a police spokeswoman said.

“The death is being investigated by Major Crime detectives; early indication is the death is not suspicious.”

Sexual assault claims

Prince Andrew attends the Royal Family's Christmas Day service at St. Mary Magdalene's church. File pic: Reuters
Image:
Prince Andrew has denied all claims of wrongdoing. File pic: Reuters

Ms Giuffre sued the Duke of York for sexual abuse in August 2021, saying Andrew had sex with her when she was 17 and had been trafficked by his friend, the billionaire paedophile Jeffrey Epstein.

The duke has repeatedly denied the claims, and he has not been charged with any criminal offences.

In March 2022, it was announced Ms Giuffre and Andrew had reached an out-of-court settlement – believed to include a “substantial donation to Ms Giuffre’s charity in support of victims’ rights”.

She stuck by her version of events until the end

Of the many dozens of victims of Jeffrey Epstein, it was Virginia Giuffre who became the most high-profile.

She was among the loudest and most compelling voices, urging criminal charges to be brought against Epstein, waving her right to anonymity in 2015.

She told how he and Ghislaine Maxwell groomed her and “passed around like a platter of fruit” to be used by rich and powerful men.

But her name and face became known around the world after she accused Prince Andrew of sexually abusing her when she was 17 years old.

The picture of her together with the prince and Maxwell at the top of a staircase, his hand around her waist, is the defining image of the whole scandal.

Prince Andrew said he had no memory of the occasion. But Giuffre stuck by her version of events until the end.

‘An incredible champion’

Sigrid McCawley, Ms Giuffre’s attorney, said in a statement that she “was much more than a client to me; she was a dear friend and an incredible champion for other victims”.

“Her courage pushed me to fight harder, and her strength was awe-inspiring,” she said. “The world has lost an amazing human being today.”

“Rest in peace, my sweet angel,” she added.

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Dini von Mueffling, Ms Giuffre’s representative, also said that “Virginia was one of the most extraordinary human beings I have ever had the honour to know”.

“Deeply loving, wise, and funny, she was a beacon to other survivors and victims,” she added. “She adored her children and many animals.

“She was always more concerned with me than with herself. I will miss her beyond words.

“It was the privilege of a lifetime to represent her.”

Ms Giuffre said at the end of March she had four days to live after a car accident, posting on social media that “I’ve gone into kidney renal failure”. She was discharged from hospital eight days later.

Raised mainly in Florida, she said she was abused by a family friend early in life, which led to her living on the streets at times as a teenager.

She said that in 2000, she met Ghislaine Maxwell, a British socialite who was convicted in 2021 on federal sex trafficking and conspiracy charges and was sentenced to 20 years in prison.

Undated handout photo issued by US Department of Justice of Ghislaine Maxwell with Jeffrey Epstein, which has been shown to the court during the sex trafficking trial of Maxwell in the Southern District of New York. The British socialite is accused of preying on vulnerable young girls and luring them to massage rooms to be molested by Epstein between 1994 and 2004. Issue date: Wednesday December 8, 2021.
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Ghislaine Maxwell and Jeffrey Epstein. Pic: US Department of Justice

Ms Giuffre said Maxwell then introduced her to Epstein and hired her as his masseuse, and said she was sex trafficked and sexually abused by him and associates around the world.

‘A survivor’

After meeting her husband in 2002, while taking massage training in Thailand at what she said was Epstein’s behest, she moved to Australia and had a family.

She founded the sex trafficking victims’ advocacy charity SOAR in 2015, and is quoted on its website as saying: “I do this for victims everywhere.

“I am no longer the young and vulnerable girl who could be bullied. I am now a survivor, and nobody can ever take that away from me.”

:: Anyone feeling emotionally distressed or suicidal can call Samaritans for help on 116 123 or email jo@samaritans.org in the UK. In the US, call the Samaritans branch in your area or 1 (800) 273-TALK.

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Politics

Crypto banking rule withdrawal by Fed ‘not real progress’ — Senator Lummis

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Crypto banking rule withdrawal by Fed ‘not real progress’ — Senator Lummis

Crypto banking rule withdrawal by Fed ‘not real progress’ — Senator Lummis

United States Senator Cynthia Lummis suggests the crypto industry may be celebrating too soon over the US Federal Reserve softening its crypto guidance for banks.

“The Fed withdrawing crypto guidance is just noise, not real progress,” Lummis said in an April 25 X post. Lummis called the Fed’s April 24 announcement — withdrawing its 2022 supervisory letter that had discouraged banks from engaging with crypto and stablecoin activities — “just lip service.”

Lummis’ tone was different from the rest of the crypto industry

Lummis, a pro-crypto advocate known for introducing the Bitcoin (BTC) Strategic Reserve Bill in July 2024, pointed out several flaws in the Fed’s announcement, even as Strategy founder Michael Saylor and crypto entrepreneur Anthony Pompliano suggested it was a step forward for banks and crypto.

Cryptocurrencies, United States
Source: Anthony Pompliano

She argued that the Fed continues to “illegally flout the law on master accounts” and still relies on reputational risk in its bank supervision practices. It comes as the Federal Insurance Deposit Corporation (FDIC) is working on a rule to stop examiners from considering reputational risk when reviewing a bank’s operations, according to a recent Bloomberg report.

Lummis also highlighted the Fed’s policy statement in Section 9(13), which hasn’t been withdrawn, stating that Bitcoin and digital assets are considered “unsafe and unsound.”

She also reiterated many of the same staff behind Operation Chokepoint 2.0 are still involved in crypto policy today.

“We are NOT fooled. The Fed assassinated companies within the industry and hurt American interests by stifling innovation and shuttering businesses. This fight is far from over.”

“I will continue to hold the Fed accountable until the digital asset industry gets more than a life jacket, Chair Powell — they need a fair shake,” Lummis said.

Related: If Trump fired Powell, what would happen to crypto?

Custodia Bank founder and CEO Caitlin Long seemed to share a similar view to Lummis.

“THANK YOU for seeing this for what it is,” Long said.

Cryptocurrencies, United States
Source: David Sacks

However, many crypto executives praised the Fed’s announcement as a positive development for the industry. Saylor said in an April 25 X post that the Fed’s move means that “banks are now free to begin supporting Bitcoin.”

Anastasija Plotnikova, co-founder and CEO of blockchain regulatory firm Fideum, said the Fed’s decision “is a significant development, as it will simplify the path to institutional adoption.”

Magazine: Ethereum is destroying the competition in the $16.1T TradFi tokenization race

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Science

Water on Ancient Mars? New Study Challenges the Cold Planet Theory

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Water on Ancient Mars? New Study Challenges the Cold Planet Theory

Despite being a vast and inhospitable planet today, scientists believe Mars, the Red Planet, used to look much like Earth, the Blue Planet. Over the last four years, NASA’s Perseverance rover has wandered across an area of Mars where researchers believe a powerful river once poured into a crater, forming a sizable delta. According to computer models, ancient Mars most likely had frequent snowfall and rain, which shaped the enormous networks of lakes and river basins. In the Journal of Geophysical Research: Planets, a recent study found that the distribution of these land characteristics is more consistent with precipitation models than with only the consequences of melting ice caps.

Investigating Early Martian Climate Through Modeling

The researchers published their findings April 21 in the Journal of Geophysical Research: Planets. According to the research by geologists at the University of Colorado in Boulder, our planetary neighbour, on average 140 million miles away in space, was warm and wet billions of years ago. This challenges a long-held belief that early Mars was mostly cold and icy. However, there’s a vital mystery buried in the story: It’s unclear where Mars’ water could have come from, and most climate models predict the world exhibits surface temperatures that are far too cold to sustain liquid water, raising questions about how those visible geological features could have formed.

“It’s very hard to make any kind of conclusive statement,” Amanda Steckel, a postdoctoral researcher at the California Institute of Technology’s Division of Geological and Planetary Sciences, said in a statement. “But we see these valleys beginning at a large range of elevations. It’s hard to explain that with just ice,” she further added in the official blog posted by University of Colorado. 

Through computer simulations, Steckel and her team explored what Mars might have looked like during the Noachian epoch, when water may have drastically shaped the planet’s surface, some 4 billion years ago. Initially created for Earth, their model was modified to simulate how Mars’ landscape changed near the equator, where expansive channel networks extend from the highlands and drain into ancient lakes, possibly even an ocean. NASA’s Perseverance rover is currently exploring one of these sites, Jezero Crater, where a once-powerful river poured into the basin.

Comparing Climate Models and Implications for Planetary History

The group explored two major simulation models, the ice-melt model and the wet and warm model for how precipitation might have created the valleys on Mars: one in which the planet was warm and humid, and another in which ice briefly melted at the edge of a huge ice cap, signifying a cold, arid climate. With valley roots showing up in radically diverse places, each scenario produced a very different Mars.

Their goal was to determine whether ancient Mars may have had a more Earth-like climate, at least for a while. While more evidence is needed and answers to questions, such as how the planet stayed warm enough for rain or snow, are part of an ongoing investigation. Still, Hynek said the study offers valuable clues, not just about Mars, but about the early history of Earth as well.

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