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 ...

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

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

"Gaia provides the first accurate view of what our section of the Milky Way would look like from above," Lewis McCallum, an ...

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