The Hera probe has swung around Mars, using the planet’s gravitational pull to fling itself toward its asteroid target.

Earth gained a temporary mini-moon for a period of two months ... This scenario could account for the Moon's current orbital characteristics. Williams and Zugger's calculations demonstrate ...

A new study suggests the dwarf planet and its scarcely smaller moon likely ... for a period of time, billions of years ago, before separating into a stable, long-term orbital dance.