The Kuiper Belt: The Solar System’s Icy Frontier

Beyond Neptune lies the Kuiper Belt—think of it as the asteroid belt’s colder, icier cousin. Instead of mostly rock and metal, Kuiper Belt objects are rich in ices like water, methane, and ammonia.

Pluto is the most famous Kuiper Belt object, but it’s far from alone. This region contains countless small worlds, many of which we’re still discovering.

Studying Kuiper Belt objects helps us understand what the outer Solar System was like when it formed, because these bodies have been deep-frozen for billions of years.