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 ...

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

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