Water covers 71 percent of Earth's surface, giving rise to the nickname "the Blue Marble" or "the Blue Planet." Satellites that observe ocean color, however, show that it's not that simple. Materials ...

Mysterious, light-colored swirls on Moon's surface could be rocks magnetized by magma activity underground, laboratory experiments confirm. Lunar swirls are light-colored, sinuous features on the Moon ...

Lunar swirls are light-colored, sinuous features on the Moon’s surface, bright enough to be visible from a backyard telescope. Some people think they look like the brushstrokes in an abstract painting ...