Black holes could be the key to time travel and "billions of years just pass in minutes", billions of years would pass in "several minutes" if you fell into a black hole, one researcher said surprisingly, given the phenomenon's ability to stretch out time. Time dilation is the difference in time measured on two watches. Imagine one of these clocks being placed on a spacecraft traveling at the speed of light or near the speed of light, and the other remaining on Earth.
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Atharva Palshetkar
of CTES College, Mumbai, India, said on the Q+SA site “Because it is so close
to the black hole, time affects the spacecraft and gets slower as it gets
closer to the black hole...
Now, if someone saw you fall into a black hole, they would see you going slower and slower, it could take weeks, years, and even decades until you reach a point where light cannot escape the black hole's event horizon.
“Viewers then see a spacecraft stuck on the event
horizon until it moves towards red and gradually disappears.
“Meanwhile, when you enter a black hole,
everything you see outside will start to come out quickly.
“Your family, your children, your grandchildren, hundreds of generations will grow and fall in minutes and hours.
But what about
Wormholes?
Wormholes are
still just a theory today,” van Breukelen said. “But, in principle, an
artificial black hole could be created, for example using a particle
accelerator, even if it had to be a billion kilometers long, the same distance
the Earth travels around the sun in a year.