From space slugs to lunar cemeteries, these movies, games, and books show that the undead can arrive from above, as well as below.

From Viking to Perseverance, scientists have spent decades chasing chemical hints that could point to life beyond Earth.

Released by Topps in the early 1960s, the Mars Attacks line provoked parental outrage for its provocative imagery regarding a hostile alien invasion of Earth.

An alien doorway on Mars, as captured by Mast Camera (Mastcam) onboard NASA's Mars rover Curiosity on Sol 3466 (image courtesy NASA) Scientists and David Bowie have all famously wondered if there is ...