Are black holes time machines? Yes, but there is a problem

Black holes are natural time machines that allow travel to the past and the future. But don’t expect to be back to visit dinosaurs anytime soon.

Right now, we don’t have a spacecraft that can bring us anywhere near a black hole. But even leaving those small details aside, trying to travel into the past with a black hole might be the last thing you ever do.

What are black holes?

A black hole is an extremely massive object that usually forms when a dying star collapses in on itself.

Like planets and stars, black holes have gravitational fields around them. The gravitational field is what keeps us stuck to the Earth, and what keeps the Earth revolving around the sun.

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