Thrusting off his heretical shackles, he reportedly suggested that spaceships will one day be so fast that we won't know whether we've come or gone. Hawking suggests that Einstein's theories of relativity will become as relatively obsolete as, who knows, the home phone. He posits that, at some point when we're all long gone, a day on a spaceship traveling at 650 million miles per hour would be akin to one year on Earth.
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