Time travel, with Lawrence Krauss
Instant Genius
00:00
How Much Energy Do We Need for Time Travel?
The prototypical time machine is a wormhole. Mathematically, that's possible to create general relativity. A wormhole would be a time machine. In order to create a wormhole, you have to have a very special type of energy. There are lots of arguments that suggest it's extremely difficult to do in the laboratory. But we know for sure that at least allows for that possibility. So Stephen Hawking bet it could be done too, but we don't know if it will work.
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