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Saturn's largest moon, Titan possesses an ammonia and methane atmosphere that obscures its frozen surface from view. Since a 1980 Voyager I flyby, ...

Neptune may have polished off a super-Earth that once roamed the outer solar system and stolen its moon to boot. The brutal deed could explain mysterious heat radiating from the icy planet and the odd orbit of its moon Triton.

The earthquake that killed more than 700 people in Chile on Feb. 27 probably shifted the Earth's axis and shortened the day, a National Aeronautics and Space Administration scientist said.

A journey from Earth to Mars could soon take just 39 days -- cutting current travel time nearly six times -- according to a rocket scientist who has the ear of the US space agency.

Astronauts are taking in "absolutely spectacular" views of Earth as they crank open shutters inside the International Space Station's new $27 million observation deck....

The first decade of the 21st century was the warmest ever on Earth according to data released by scientists at NASA.

Russia's space chief said Wednesday his agency will consider sending a spacecraft to a large asteroid to knock it off its path and prevent a possible collision with Earth.

Astronomers announced this week they found a water-rich and relatively nearby planet that's similar in size to Earth.

It took 13 billion years to reach Earth, but astronomers have seen the light of an exploding mega-star that is the most distant object ever detected, two studies published Thursday reported.

A small asteroid will buzz the Earth late Friday night, flying just inside the orbit of the moon. It should fly safely by our home planet, according to a crack team of NASA space rock trackers.