Neptune once had a Great Dark Spot similar to Jupiter's Great Red Spot. To escape Neptune's gravity you need to travel 52,600 miles per hour. Terri Field Johann Galle and Heinrich D'Arrest discovered Neptune in 1846. Neptune has at least 8 moons. The two largest moons are Triton and Nereid.
Triton is made of rock and ice.
Its surface is rich in water ice, dry ice, and frozen carbon monoxide, methane, and nitrogen. Triton has cold geysers that spit nitrogen instead of the hot water that Earth geysers release. Neptune was the Roman god of the oceans. Kalmbach Publishing Co.