Ready to talk GRAVITY? Former NASA astronaut & International Space Station commander Leroy Chiao here. AMA.
Hi, I'm Leroy Chiao. I was a NASA Astronaut for 15 years, and during that time I flew 4 times into space. In my first three missions, those flights took place on space shuttles, and on my fourth mission, I trained with the Russians, flew on a Russian rocket to the International Space Station, and then served as the International Space Station commander for six and a half months (yes, that's a long time). During my career I performed six spacewalks, four in American suits and two in Russian suits, and these were all in support of helping to build the International Space Station.
In fact, I'm sure someone will ask me this, but the whole idea of falling or being thrown off of the station like that in GRAVITY is the ultimate nightmare of someone out doing a spacewalk…
So go ahead, I'm ready to take your questions. AMA!