Life on Earth may exist thanks to an incredible stroke of luck — a chemical sweet spot that most planets miss during their formation but ours managed to hit.

The key to solving the mystery of the Viking results is the discovery of perchlorate on the Martian surface in 2008.

Scientists may need to broaden their horizons in their search for alien life.

"We used to think that only very simple molecules could be created in these clouds. But we have shown that this is clearly not the case."

We frequently question whether we are alone in the universe.

Tiny delays in pulsar signals measured by SETI scientists could aid the search for gravitational waves and extraterrestrial life.

SETI@home has been one of the largest citizen science projects ever, with millions of users around the world.

The observatory will combine tech from NASA's most powerful space telescopes.

New models suggest that Europa has very little tectonic activity at its seafloor, which is potentially catastrophic news for the hopes of finding alien life within its ocean.

The new findings strengthen the "RNA world" hypothesis that describes how the first life on Earth could have used RNA instead of DNA.