Earth has a number of mini-moons and quasi-moons. Mini-moons are objects that orbit our planet. But they make for fickle fans: They tend to swing around Earth for only a matter of months. One example ...

Much as we may treasure and proclaim our independence, we actually live in a protective bubble called the heliosphere.

Every year, the moon, Earth's reliable celestial companion for 4.5 billion years, is getting 1.5 inches away. The distance to ...

In a once-a-year event, Saturn is about to reach opposition, with the ringed planet appearing its best and brightest as it ...