Neptune is the eighth planet from the Sun and has 14 known moons, with the largest being Triton. Triton is unique because it orbits Neptune in the opposite direction of the planet's rotation, a phenomenon known as retrograde orbit. This suggests that Triton may have been captured by Neptune's gravity rather than forming alongside it. Other notable moons include Proteus, which is irregularly shaped and heavily cratered, and Nereid, known for its highly elliptical orbit. These moons vary in size and characteristics, showcasing the diverse environment surrounding Neptune and providing valuable insights into the formation of the Neptunian system.