Human beings have evolved to become "perfectly adapted to life on Earth", said Sky News. So, spending time in space, without gravity or sunlight, and exposed to radiation, "poses a real challenge, ...

The weird and wonderful world of sleeping in space — and what studies of astronauts tell us about the future of sleep ...

Space changes you. It strengthens some muscles, weakens others, shifts fluids within your body, and realigns your sense of balance. NASA's Human Research Program works to understand—and sometimes even ...

Longtime NASA astronaut Don Pettit, who has ventured to space four times, returned to Earth on Saturday night from the International Space Station. Pettit, who turned 70 on Sunday, landed at 9:20 p.m.

"The great thing that I found when I began to live my life as an astronaut was that the world seemed so different. It was as if I was viewing my environment with a fresh pair of eyes." - John Barlow, ...

NPR's Scott Detrow speaks with Cristina Costantini, director of the new documentary, Sally, about the life of astronaut Sally Ride.