Neil DeGrasse Tyson Says Scott Kelly Aged More Slowly In Space, And He's Right

Astronaut Scott Kelly got countless "welcome home" messages on Twitter following his return to Earth Tuesday after spending almost a year in space.

But a tweet from Neil deGrasse Tyson stood out for referencing Albert Einstein's theory of relativity -- and for noting one particularly mind-bending implication it has for Kelly, given his long stint in orbit:

Welcome back to Earth, Scott Kelly. After a year in orbit, Relativity says you’re 1/100 sec younger than you’d otherwise...

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