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 ...

A discovery of ancient rocks might finally answer one of the biggest questions in science: how did the Moon form? Researchers have uncovered chemical clues from 3.7-billion-year-old feldspar crystals ...