What happened when one twin went to space and the other stayed home? 2

What happened when one twin went to space and the other stayed home?

Twins Scott and Mark Kelly

Scott (L) and Mark (R) Kelly took part in a unique experiment

Rex/AP

NASA astronaut Scott Kelly spent a year in space and came back a slightly changed man – at least, in comparison to his twin brother Mark, who was earthbound while Scott was aboard the International Space Station. This experiment, conducted from March 2015 to March 2016, will help us plan for astronauts to travel for years to Mars or beyond.

Scott and Mark (himself a former astronaut) both gave NASA scientists samples of their blood, urine and faeces before, during and after the year-long flight …

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