Earth is the only rocky planet in the solar system with a significant moon. And the moon really is significant: It's roughly 1.2% the mass of Earth. That may not be big in an absolute sense ...

March's full moon will turn a different color for a bit tonight. But why? Here's why the moon takes on a red or orange color ...

A total lunar eclipse occurs when the Earth is positioned directly between the moon and sun, blocking the sun's rays from the ...

Earth’s shadow will block most of the light that illuminates the lunar surface, creating what is known as a blood moon.

Illustration of a stage in the formation of the Earth-moon system. The Earth had recently formed (4,600 million years ago) when it was struck by a large protoplanet, sometimes dubbed Theia ...