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Where Do Black Holes Lead?

So there you are, about to leap into a black hole . What could possibly await should – against all odds – you might survive? Where would you end up and what tantalizing tales would you be able to regale if you managed to clamor your way back?

The simple answer to all these questions is, as Professor Richard Massey explains, "Who knows?" As a Royal Society research fellow at the Durham University Computational Cosmology Institute, Massey is fully aware that the mysteries of black holes run deep. "Falling through an event horizon is literally going beyond the veil – once someone falls past it, no one could ever send a message back," he said. "They'd be ripped to pieces by the enormous gravity, so I doubt anyone falling through would get anywhere."

If that sounds like a disappointing ̵

1; and painful – answer, then it is to be expected. Ever since Albert Einstein's general theory of relativity was considered to have predicted black holes by linking space-time with the action of gravity, it has been known that black holes result from the death of a massive star leaving behind a small, dense remnant core. Assuming this core has more than roughly three-fold the mass of the sun gravity would overwhelm to such a degree that it would fall into itself into a single point, or singularity, understood to be the black hole's infinitely dense core.

Related: 9 Ideas About Black Holes That Will Blow Your Mind

The resulting uninhabitable black hole would have such a powerful gravitational pull that not even light could avoid it. So, should you then find yourself at the event horizon – the point at which light and matter can only pass inward, as proposed by German astronomer Karl Schwarzschild – there is no escape. According to Massey, tidal forces would reduce your body into strands of atoms (or 'spaghettification', as it is also known) and the object would eventually end up crushed at the singularity. The idea that you could pop out somewhere – maybe at the other side – seems utterly fantastic.

What about a wormhole?

Or is it? Over the years, scientists have looked into the possibility that black holes could be wormholes to other galaxies. They may even be, as some have suggested, a path to another universe.

Such an idea has been floating around for some time: Einstein teamed up with Nathan Rosen to theorize bridges that connect two different points in space-time in 1935. But it gained some fresh ground in the 1980s when physicist Kip Thorne – one of the world's leading experts on the astrophysical implications of Einstein's general theory of relativity – raised a discussion about whether objects could physically travel through them.

"Reading Kip Thorne's popular book about wormholes is what first got me excited about physics as a child, "Massey said. But it doesn't seem likely that wormholes exist.

Indeed, Thorne, who lent his expert advice to the production team for the Hollywood movie Interstellar, wrote: "We see no objects in our universe that could become wormholes as they age , "in his book" The Science of Interstellar "(WW Norton and Company, 2014). Thorne told Space.com that journeys through these theoretical tunnels would most likely remain science fiction, and there are certainly no firm records that a black hole could allow for such a passage.

Artist's concept of a wormhole. If wormholes exist, they might lead to another universe. But, there is no evidence that wormholes are real or that a black hole would act like one.

(Image credit: Shutterstock)

But the problem is that we can't get up close to see for ourselves. Why, we can't even take photos of anything that takes place inside a black hole – if light can't escape their immense gravity then nothing can be snapped by a camera. As it stands, the theory suggests that anything that goes beyond the event horizon is simply added to the black hole and, what's more, because time distorts close to this boundary, this will appear to take place incredibly slowly, so answers won't be quick

"And think the standard story is that they lead to the end of time," said Douglas Finkbeiner, professor of astronomy and physics at Harvard University. "An observer far away will not see their astronaut friend fall into the black hole. They will just get redder and fainter as they approach the event horizon [as a result of gravitational red shift]. But the friend falls right in, to a place beyond 'forever.' Whatever that means. "

Maybe a black hole leads to a white hole

Certainly, if black holes lead to another part of a galaxy or another universe, there would need to be something opposite to them on the other side . Could this be a white hole – a theory put forward by Russian cosmologist Igor Novikov in 1964? Novikov suggested that a black hole links to a white hole that exists in the past. Unlike a black hole, a white hole will allow light and matter to leave, but light and matter will not be able to enter.

Scientists have continued to explore the potential connection between black and white holes. In their 2014 study published in the journal Physical Review D physicists Carlo Rovelli and Hal M. Haggard stated that "there is a classic metric satisfying the Einstein equations outside a finite space-time region where matter collapses into a the black hole and then emerges from a while hole. " In other words, all of the material black holes have swallowed could be spewed out, and black holes may become white holes when they die.

Far from destroying the information that it absorbs, the collapse of a black hole would be halted. It would instead experience a quantum bounce, allowing information to escape. Should this be the case, it would shed some light on a proposal by former Cambridge University cosmologist and theoretical physicist Stephen Hawking who, in the 1970s, explored the possibility that black holes emit particles and radiation – thermal heat – as a result of quantum fluctuations.

"Hawking said a black hole does not last forever," Finkbeiner said. Hawking calculated that radiation would cause a black hole to lose energy, shrink and disappear, as described in his 1976 paper published in Physical Review D . Given his claims that radiation emitted would be random and contain no information about what had fallen in, the black hole, upon its explosion, would erase loads of information.

This meant Hawking's idea was at odds with quantum theory, which says information cannot be destroyed. Physics states information just becomes more difficult to find because, should it become lost, it becomes impossible to know the past or the future. Hawking's idea led to the 'black hole information paradox' and it has long puzzled scientists. Some have said Hawking was simply wrong, and the man himself even declared he had made a mistake during a scientific conference in Dublin in 2004.

So, we go back to the concept of black holes emitting preserved information and throwing it back out through a white hole? Maybe. In their 2013 study published in Physical Review Letters Jorge Pullin at Louisiana State University and Rodolfo Gambini at the University of the Republic of Montevideo, Uruguay, applied loop quantum gravity to a black hole and found that gravity increased towards the core but decreased and plonked whatever was entering into another region of the universe. The results gave extra credence to the idea of ​​black holes serving as a portal. In this study, singularity does not exist, and it does not form an impenetrable barrier that ends up crushing whatever it encounters. It also means that information does not disappear.

Maybe black holes go nowhere

Yet physicists Ahmed Almheiri, Donald Marolf, Joseph Polchinski and James Sully still believe Hawking could have been on something. They worked on a theory that became known as the AMPS firewall, or the black hole firewall hypothesis. By their calculations, quantum mechanics could feasibly turn the event horizon into a giant wall of fire and anything coming into contact would burn in an instant. In that sense, black holes lead nowhere because nothing could ever get inside.

This, however, violates Einstein's general theory of relativity. Someone crossing the event horizon should not actually feel any great hardship because the object would be in free fall and based on the equivalence principle that the object – or person – would not feel the extreme effects of gravity. He could follow the laws of physics present elsewhere in the universe, but even if he did not go against Einstein's principle it would undermine quantum field theory or suggest information could be lost.

Related: 11 Fascinating Facts About Our Milky Way Galaxy

impression of a tidal disruption event that occurs when a star passes too close to a supermassive black hole.

(Image credit: All About Space magazine)

A black hole of uncertainty

Step forward Hawking once more. In 2014, he published a study in which he eschewed the existence of an event horizon – meaning there is nothing there to burn – saying gravitational collapse would produce an 'apparent horizon' instead.

suspend light rays trying to move away from the core of the black hole, and would persist for a "period of time." In his rethinking apparent horizons temporarily retain matter and energy before dissolving and releasing them later down the line. This explanation best fits with quantum theory – which says information can't be destroyed – and if it has ever been proven, it suggests that anything could escape from a black hole.

Hawking went as far as saying black holes may not even exist. "Black holes should be redefined as metastable bound states of the gravitational field," he wrote. There would be no singularity, and while the apparent field would move inwards due to gravity, it would never reach the center and be consolidated within a dense mass.

And yet anything that is emitted will not be in the form of the information swallowed. It would be impossible to figure out what went in by looking at what is coming out, which causes problems of its own – not least for, say, a human who found themselves in such an alarming position. They'd never feel the same again!

One thing's for sure, this particular mystery is going to swallow up many more scientific hours for a long time to come. Rovelli and Francesca Vidotto recently suggested that a component of dark matter could be formed by remnants of evaporated black holes, and Hawking's paper on black holes and 'soft hair' was released in 2018 and describes how zero-energy particles are left around the point of no return, the event horizon – an idea that suggests information is not lost but captured.

This flew into the face of the no-hair theorem that was expressed by physicist John Archibald Wheeler and worked on the basis that two black holes would be indistinguishable to an observer because none of the special particle physics pseudo-charges would be conserved. It's an idea that has got scientists talking, but there's some way to go before it's seen as the answer for where black holes lead. If only we could find a way to leap into one.

(Image credit: All About Space magazine)

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