Astronauts spill secrets to space toilet training

Gigantic airship will also serve as 'stratellite'

Scientists may have discovered the origin of life

Color-changing planets could reveal alien life

Space Shuttle Atlantis: Things you didn't know

Mars likely to remain free of Earth's microbes

Astronauts work in space, or 65 feet underwater

Aerospace pioneer plans private moon base

New solar satellite may help clean up space junk

Space tourism just got a bit cheaper

Scientists eager to find alien life get big boost

NASA's new asteroid mission could avert disaster on Earth