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 ...

Dark matter is an elusive type of matter that does not emit, reflect or absorb light, yet is predicted to account for most of ...

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

A few sunlit ridges beside ice-rich craters could become lunar chokepoints, unless Asia writes simple, shared rules now.

Astronomers are using radio pulses from space to find missing baryonic matter and learn about supermassive black holes, ...