Time travel? Sure, but it’s a one-way ticket


If you want to travel into the future, you’re in luck, says Brian Cox, a British physicist. The problem is finding a way home, the Daily Telegraph reports.

“Can you build a time machine? The answer is yes, you can go into the future. You’ve got almost total freedom of movement in the future,” explains Cox, who hosts science programs on the BBC.

“If you go fast (in a plane or a rocket), your clock runs slow relative to people who are still. As you approach the speed of light your clock runs so slow that you could come back 10,000 years in the future.”

Returning to your original time period isn’t that easy, however. You’ll need that Star-Trek staple: a wormhole.

“In General Relativity, you can (return) in principle. It’s to do with building these things called wormholes; shortcuts through space and time,” Cox says. “But most physicists doubt it. Hawking came up with the ‘chronology protection conjecture’ — physics we don’t yet understand that means wormholes are not stable.”