The Kuiper Belt is a disc in the solar system, extending from Neptune’s orbit to 50 AU from the Sun. The belt is like an asteroid belt, but it is far larger and more massive, containing many small bodies and remnants from the formation of the solar system. As expected, most objects in the Kuiper Belt tend to stay in it, however, there is evidence that an object from the Kuiper Belt made its way out of the belt and inside of Neptune’s orbit. This object is known as Triton, and is one of Neptune’s moons. Triton was discovered in 1846, only 17 days after Neptune itself was discovered. Triton, if not taken into Neptune’s orbit, would have been classified as a dwarf planet and actually has a composition quite similar to Pluto. Triton has many interesting qualities, the first being that it is the only known moon in the solar system with retrograde orbit. This means that Triton orbits Neptune in the opposite direction that Neptune spins. Triton is similar to most moons on the outskirts of the solar system in that it has a rocky, icy composition, however, it is very unique given that it is geologically active. Its geologically activity causes a phenomenon known as cryovolcanism, where geyser-like volcanic vents break through the crust and spray nitrogen gas. Due to our lack of knowledge of Triton’s past, it is hard to say with certainty, but some astrobiologists even speculate that Triton may have water under its icy surface.