Black holes form natural time machines that allow travel to both the past and the future. But don't expect to be visiting dinosaurs any time soon.
Black holes form natural time machines that allow travel to both the past and the future. But don’t expect to be heading back to visit the dinosaurs any time soon.
Incidentally, that’s why black holes are black: we can't bounce light off a black hole the way we might bounce a flashlight's beam off a tree in the dark. The valley created by a black hole gets steeper and steeper as you approach it from a distance. The point at which it gets so steep that light can't escape is called the event horizon.
In this way, black holes can be used to travel to the future. If you want to jump into the future of Earth, simply fly near a black hole and then return to Earth. This creates a natural time machine. If you could somehow get onto the loop, which physicists call a closed timelike curve, you would find yourself on a trajectory through space that starts in the future and ends in the past.
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