Triton (moon)

Triton (trye'-tən, IPA: , Greek Τρίτων), or Neptune I, is the planet Neptune's largest moon and the seventh largest moon in the Solar System. Triton has a complex geological history and it is believed to have a relatively young surface. It was discovered by British astronomer William Lassell on October 10, 1846, just 17 days after the planet itself was discovered by German astronomer Johann Gottfried Galle. It is also believed to be a captured Kuiper Belt object.