NASA’s latest experiment is something straight out of a sci-fi horror movie. Mostly because it involves identical twins—apologies to any twins out there in the audience, but movies have taught us to fear you (The Shining, Dead Ringers), or at least be wary of your wacky shenanigans (The Parent Trap). The space agency plans to use a pair of identical twin astronauts to determine the effects of long-terms space travel on the human body.
In March 2015, astronaut Scott Kelly will embark on a yearlong mission. He’ll hang out with cosmonaut Mikhail Kornienko on the International Space Station (ISS) for the duration, and when he returns to Earth, he’ll undergo all manner of tests and poking and prodding in order to determine the consequences of such a jaunt on his body.