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

Black holes form natural time machines that allow travel to both the past and the future. But don’t expect to return anytime soon to visit the dinosaurs.

At present, we don’t have a spacecraft that can get us close to a black hole. But, even leaving that little detail aside, trying to travel back in time using 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. A gravitational field is what keeps us glued to the Earth and what makes the Earth revolve around the Sun.

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