NASA's Cassini spacecraft
successfully completed its 26-hour
gravity observation at Saturn's
moon Enceladus recently, sending back
d

NASA's Cassini Spacecraft has
captured the first flash of sunlight
reflected off a lake on Saturn's
moon Titan, confirming the prese

In the new blockbuster Avatar, humans
visit the habitable -- and inhabited
-- alien moon called Pandora.
Life-bearing moons like Pandora or