New discoveries reveal that everything we know about our moon could be wrong, and now, investigators race to understand the mysteries of its dark and violent past.

Tabby's Star, a mysterious star hundreds of light years away, might hold the hard evidence of extraterrestrial life, as experts speculate that its bizarre behavior points to proof of a massive alien-made megastructure.

New discoveries are changing everything we know about Saturn's rings, revealing that they're newer and more mysterious than we ever imagined and that someday soon they might disappear forever.