Cosmic Queries – Back to School Edition
StarTalk Radio
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Are There Time Machines?
There's a law of physics that prevents you from going back in time. Time travelers who went back to the Titanic to see its sink are what actually sunk the Titanic. The real question is if they're, oh, Stephen Hawking held a party for all time travelers of the future. And he said if you're a time traveler, we will expect you to show up right in front of me. Because it's Stephen Hawking. He's sitting there in his wheelchair and everybody's around. And they got an open summoner and nobody appears. So that could mean that a time machine will never be invented in the future or it's been invented but not yet used.
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