Astronauts have a down-to-Earth problem that could be even worse on a long trip to Mars: They can't get enough sleep. And over time, the lack of slumber can turn intrepid space travelers into drowsy couch potatoes, a new study shows.
NASA astronaut Scott Kelly is already bracing for an unprecedented one-year mission aboard the International Space Station. He figures it will be as grueling as climbing Mount Everest.
A former space shuttle commander whose twin brother is married to former Rep. Gabrielle Giffords will attempt the longest spaceflight ever by an American.
The U.S. and Russia named the two men on Monday who will spend a year aboard the International Space Station to gather more data on the impact of outer space on humans to help prepare for future interplanetary missions.

A former space shuttle commander whose twin brother is married to former Rep. Gabrielle Giffords will attempt the longest spaceflight ever by an American.
The United States and Russia on Monday named the two men who will spend a year aboard the International Space Station to gather more data on the impact of outer space on humans to help prepare for future interplanetary missions.

A former space-shuttle commander whose twin brother is married to former Rep. Gabrielle Giffords will attempt the longest spaceflight ever by an American.

A Russian Soyuz capsule carrying three astronauts who lived six months on the International Space Station touched down safely, but one day late, Saturday morning in the cloudy, central steppes of Kazakhstan.
A manned Soyuz capsule with two Russian cosmonauts and an American astronaut onboard has successfully undocked from the International Space Station after the crew resolved glitches that had prevented departure a day earlier.