When it comes to the search for life elsewhere in the universe, methane and other chemical compounds are seen as signs of ...

Earth’s history has been shaped by five mass extinctions—catastrophic periods when life changed so dramatically that entire ...

Are we alone in the universe? Consider mysterious "extraterrestrial" radio signals. Unexplained gases on other planets.

Project Hail Mary, Solaris, and The Hitchhiker's Guide to the Galaxy are all among the very best sci-fi books set in space.

That sharp, briny smell is not the salt, it is a gas made by life, breathed out by tiny ocean creatures too small to see. For ...