For generations, the question of whether life exists beyond Earth has captivated humanity. On Mars, faint traces in ancient ...

Cosmic rays could be a vital source of energy for life on icy moons, on Mars, or even on rogue planets that wander alone between stars; it's possible, scientists say, that the phenomenon could create ...

Add Yahoo as a preferred source to see more of our stories on Google. The best reason to send humans to Mars isn’t for guts or glory—or the construction of colonies to safeguard against existential ...