An interesting factoid from an article about Stephen Hawking saying that human beings will need to leave earth for outer space in order to survive:
University of Michigan astrophysicist Katherine Freese told Big Think that the closest star to Earth is Proxima Centauri. That’s 4.2 light years away, which means man could reach the star in 4.2 years – if man could travel at the speed of light.
At this point man travels at about ten thousandth of light speed, which would make that journey about 50,000 years.
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