Unfortunate space travellers won’t be able to return to their own
universe, according to Hawking. But they will be able to escape
somewhere else, he has proposed at a conference in Stockholm.
Black holes in fact aren’t as “black” as people thought and could be a way of getting through to an alternative universe.
existence of alternative histories with black holes suggests this might
be possible,” Hawking said, according to a report from Stockholm
University. “The hole would need to be large and if it was rotating it
might have a passage to another universe. But you couldn’t come back to
our universe. So although I’m keen on space flight, I’m not going to try
Hawking’s proposal is an attempt to answer a problem that has
tormented physicists about what happens to things when they go beyond
the event horizon, where even light can’t get back. The information
about the object has to be preserved, scientists believe, even if the
thing itself is swallowed up — and that paradox has puzzled scientists
Now Hawking has proposed that the information is
stored on the boundary, at the event horizon. That means that it never
makes its way into the black hole, and so never needs to make its way
out again either.
That would also mean that humans might not disappear if they fall
into one. They’d either stay as a “hologram” on the edge, or fall out
“If you feel you are in a black hole, don’t give up,” he told the audience at the end of his speech. “There’s a way out.”