Exoplanets like Earth have been discovered but not all Earth-like planets are equal when it comes to alien life.

Noah Hawley stewed on an Alien spinoff years before FX even secured the rights. Now, “Alien: Earth” jumps to the small screen with all the eerie essentials of the Ridley Scott sci-fi classic: ...

A team of astronomers claims to have sniffed out a “biosignature” in the atmosphere of a distant planet called K2-18b. But not everyone agrees that it signals life. An illustration shows what ...