Warning: Space May Wreak Havoc on Your Body

S125-E-009232 (17 May 2009) --- Astronaut Mike Massimino, STS-125 mission specialist, is pictured as he peers through a window on the aft flight deck of the Earth-orbiting Space Shuttle Atlantis during the mission's fourth session of extravehicular activity (EVA) as work continues to refurbish and upgrade the Hubble Space Telescope. During the eight-hour, two-minute spacewalk, Massimino and astronaut Michael Good (background), mission specialist, continued repairs and improvements to the Space Telescope Imaging Spectrograph (STIS) that will extend the Hubble's life into the next decade.
(17 May 2009) — Astronaut Mike Massimino peers through a window on the aft flight deck of the Earth-orbiting Space Shuttle Atlantis during the mission’s fourth session of extravehicular activity (EVA) to refurbish and upgrade the Hubble Space Telescope.

Going to Mars is hot right now, just ask Matt Damon. But would you go if you knew your bones would turn into something called “pee brittle”?

Former astronaut Michael Massimino reveals the uncomfortable side of liftoff. And Dr. Jennifer Fogarty from NASA’s Human Research Program elaborates on the physical challenges humans face with longterm weightlessness.