Neptune

Structure and Surface Neptune is encircled by six rings.
Neptune, like Uranus, is an ice giant. It’s similar to a gas giant. It is made of a thick soup of water, ammonia, and methane flowing over a solid core about the size of Earth.
Neptune has a thick, windy atmosphere.

Time on Neptune
One day on Neptune goes by in 16 hours.
Neptune has such a long journey around the Sun it takes 165 Earth years to go around once. That’s a long year!

Neptune's Neighbours
Neptune has 16 moons.
Neptune is the eighth and most distant planet from the Sun. That means Uranus is Neptune’s only neighboring planet.

Quick History
Neptune was discovered in 1846 by Urbain Le Verrier, John Couch Adams, and Johann Galle.
Only Voyager 2 has visited Neptune.