Scientists suggest Titan formed from a giant moon collision that also may explain Saturn’s rings and strange moon orbits.

While 'Iron Sky' told a "story of Nazis hiding on the dark side of the Moon," the new films "shift the battleground to Mars, where the Red Menace is alive and well." ...

A moon can sit next door to another and still feel like a different world. Around Jupiter, that contrast shows up fast. Io looks scorched and bone-dry, yet it is the most volcanically active moon in ...