Scientists believe life on alien worlds may be constrained by the same factors as on our planet.

What if aliens invaded Earth? This hypothetical scenario explores what could happen if an extraterrestrial civilization ...

This story first appeared in Trying!, a thoughtful, funny, wide-ranging daily newsletter featuring essays from the mind of Matt Gross. You can sign up for them here. Those were simple aliens for ...

Add Yahoo as a preferred source to see more of our stories on Google. Some of the greatest sci-fi movies of all time revolve around humans in a desperate struggle for survival. Sometimes we're ...

The night is dark; darker than usual. There's a warm breeze in the air, but otherwise nothing stirs save for a strange metallic object careening through the sky. As it moves, a soft glow follows, ...

On the highly unlikely but equally mind-blowing instance in which aliens really do come down to our shiny blue planet to see what's what, perhaps it might not be wise for world leaders to be the first ...