Ancient Mars may have once contained more of a basic ingredient for life than Earth.
The U.S. government officially releases documents that not only acknowledge Area 51, but also give details about its purpose.
The international body charged with helping to establish names for new planets has decided to open up the process to the public.
The first aliens could be little red plants, not little green men.
We're not saying that a Martian Jurassic Park could be in our future. But seriously: Martian Jurassic Park.
Gliese 667 has three stars and three potentially habitable worlds. Our solar system has just been trumped.
Recent data from the Cassini spacecraft just added another local contender in the search for extraterrestrial life.
Life on Mars could be hidden beneath miles of rock billions of years old, a new finding on Earth suggests.
NASA’s Kepler mission has discovered two new potentially habitable planets in a solar system a lot like ours.
NASA's Volkswagen-sized Mars rover, Curiosity, has discovered evidence that Mars could have supported microbial life.