Humans have been searching the stars for alien radio signals for decades — and so far, E.T. has not phoned home. But that doesn’t mean intelligent life isn’t out there, a new study hints. Rather, ...

Voyager 1 is on a journey that will outlast civilizations, outlive the Sun’s familiar neighborhood, and eventually drift into regions of space no human made object has ever reached. It is moving ...

Planets orbiting stars beyond the solar system come in all shapes and sizes but mostly fit into a few categories: large and hot gas giants, super-Earths that are slightly larger than our planet, ...

Sagan's team created the greatest puzzle of all time, which you can only solve if your species understands the basic nature of the universe.

If you were hoping we’d find alien life hanging out on a cozy, pint-sized planet anytime soon, then you should know that ...

There is no chance in hell our species will be able to reach another Earth-like planet in the Universe in the foreseeable future, so the only way we can get a sense of the habitability of such places ...

The nature of space, time and the evolution of life on Earth mean it’s unlikely extraterrestrial life has visited our home planet.

Time works differently in space and on other planets, so the decade-plus that Alien Isolation fans have been waiting for the sequel might have felt like a blink of an eye on a different world. On ...

Barnard’s Star hosts four hostile small planets whose unusual chemistry and orbital rhythm reveal how compact planetary ...