story highlights nasa says scott kelly is 2 inches taller after spending nearly a year in space he 's about to reunite with his twin brother in houston since his return to earth , the astronaut has been sharing photos of life on the ground ( cnn ) astronaut scott kelly and his twin brother used to be the same height .
that ’s a weird but temporary side effect of spaceflight .
nasa scientists already knew that kelly would walk a little taller when he emerged from the soyuz capsule .
1 of 9 full screen autoplay close skip ad × photos : astronaut scott kelly lands after a year in space view photos the soyuz tma-18 m space capsule returns from space and lands near the town of dzhezkazgan , kazakhstan .
but even if kelly had n’t had his vitals checked immediately upon landing , he might have noticed the slight height change : one of the first earthlings he saw was his identical twin , retired astronaut mark kelly — a man now notably , if only temporarily , shorter .
march 2 inches taller than when he left for the international space station .
here 's a look at the year he spent in space , through his eyes above earth .
astronaut scott kelly spent 340 days aboard the international space station , longer than any american astronaut .