Because the Moon is over a quarter the diameter of Earth, the Earth-Moon system is often cited as the pairing in our Solar ...

Ahead of Valentine's Day, prepare to be dazzled by the lunar heart, created by the interplay of light and shadow on our Moon.

As it continues to brighten, it takes on an oblong, or "gibbous," shape until it ... as the best for basic astronomy in our best beginner's telescope guide. The next moon phase milestone will ...

The moon's ascending node (the point in the sky where its orbit crosses the ecliptic from south to north) is moving westward ...

The vast valleys of Vallis Schrödinger and Vallis Planck demonstrate the incredible forces that shaped the face of the Moon.

Five of the brightest planets will be visible to the naked eye. With help, you may even spot Uranus and Neptune.

Two gargantuan canyons on the moon were carved by a hailstorm of rocks — and that’s good news for future lunar astronauts.

Welcome to this month’s edition of “What’s up in the sky?” February has a nice lineup of planets and some eye-catching ...

New research shows that when an asteroid slammed into the moon billions of years ago, it carved out a pair of grand canyons ...