A stunning new photo captures the moon and Saturn engaged in a cosmic game of peek-a-boo. On Jan. 4, Saturn briefly hid behind the crescent moon, escaping the view of skywatchers in Europe ...

A new study implies that in the past, moons in our solar system may have had rings just like planets do — deepening the mystery of why no ringed moons exist today.

Most likely, the first alien life we discover will be hidden beneath miles of ocean on a distant world like Jupiter's moon Europa or Saturn's moon Enceladus. That's why the best way to search for ...