Today, Mars has two tiny moons. But early in its history, the Red Planet may have had a much larger moon, which might be responsible for Mars' weird shape and extreme terrain, Michael Efroimsky ...

The Kuiper Belt (also called the Edgeworth-Kuiper Belt) is a disc-shaped ... to dwarf planets like Pluto, Makemake and Eris. It’s also thought to be populated by comets and some odd objects ...