A famous theory or argument about the existence of aliens. Speech. . .

Hawking said: "From Einstein's theory of relativity, there is indeed the possibility of bending time and space and returning to the past. However, bending space-time may trigger an energy to destroy spacecraft and even space-time. "

Hawking does not believe in time travel, but he believes in the existence of aliens. He once said in the American Discovery Channel series documentary "Follow Stephen Hawking into the Universe" that there are more than 1000 billion galaxies in the universe, and each galaxy contains at least a large number of planets. Based on this figure alone, it is almost certain that alien life exists.

In Hawking's view, alien life is likely to exist in the form of microorganisms or primary organisms, but it does not rule out the existence of intelligent creatures that can threaten human beings.