Carl Sagan talks about time travel in an interview with PBS.
Since Carl was an American astronomer the thought of time travel fascinated
him. Carl mentions wormholes and that extraterrestrial life could be living on
earth and disguised in invisibility cloaks. The possibility of time travel does
exist but it would require a major advance in our technology. Einstein suggests
that no one can travel as fast as the speed of light which makes the thought of
time travel hard to believe.
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