As the Earth flies through space in its celestial dance around the sun, it's accompanied by its perpetual partner, the moon.

The moon's orbit isn't a perfect circle. Instead, it's more stretched out, kind of like an oval, which means its distance from Earth varies by about 30,000 miles (48,000 km). The surface of the moon ...

The moon is weird. It's completely unlike anything else in the solar system. So how did our planet end up with such a special ...