Space

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

Hawking reveals realistic ideas for time travel

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

Largest telescope ever built planned for Chile

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