I wouldn’t want to be this guy:

“Space and time are tangled together in a sort of a four-dimensional fabric called space-time,” said Charles Liu, an astrophysicist with the City University of New York, College of Staten Island and co-author of the book “One Universe: At Home In The Cosmos.”


Mathematically, you can certainly say something is traveling to the past, Liu said. “But it is not possible for you and me to travel backward in time,” he said. [emphasis mine]

It’s a bit dangerous to make judgements on what is or isn’t possible based on the knowledge you have today. It’s this kind of statement that gets quoted and remembered forever.

It was once impossible that the earth revolved around the sun. Cars were impossible. Space travel used to be impossible.Computers smaller than room-sized were impossible.

He’s going to seem a bit dumb when we’re all travelling backward and forward in time.


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