Topic: Earth & Space

What is the Kuiper belt?

The Kuiper belt, named after astronomer Gerard Kuiper, is a massive, icy region of our solar system that exists just beyond the planets. Actually shaped more like a donut than a flat belt, the Kuiper belt is best known as home of the dwarf planet Pluto.

Why is Pluto considered a dwarf planet?

Before Pluto was discovered, it was predicted. Astronomers had observed that massive objects can affect the orbits of its neighbors, and, after seeing deviations in the orbits of Uranus and Neptune, assumed something substantial existed beyond their orbits.