NASA explains the spooky 'negative-space jellyfish' hovering over Mars in new Curiosity rover image

NASA has moved to explain a decades old lunar photograph that some UFO enthusiasts claim shows a 3.4-mile-long alien ...

Ancient aliens Mars theory: Bizarre claims suggest metropolis existed next to long-lost ocean

Recent outlandish claims from a prominent UFO researcher suggest that a sprawling extraterrestrial metropolis once stood on ...