The traditional astrophysical recipe for life as we know it is quite simple: Get a rocky, gas-shrouded world in a “habitable zone” orbit around a star so that it’s not too hot or too cold. Then just ...

Accelerated to high energies, the particles making up cosmic rays aren’t exactly friendly to life. At least, not to life as we know it. According to a new theory, they could spark a chain of reactions ...

Add Yahoo as a preferred source to see more of our stories on Google. Saturn's moon Enceladus (shown here in a 2006 false-color image from NASA's Cassini spacecraft) is thought to harbor an ocean ...