The famous scientist, Stephen Hawking, was saying that time travel will be possible if we reach one billion km/h or same as 98% the speed of the light, and it will take 6 years to develop a spaceship to reach that speed. He also said that human may end up repopulating the world when they get in the future if natural disaster occurs.
here is the full story:
http://au.news.yahoo.com/a/-/technology/7153027/time-travel-possible-hawking
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