Sometimes, it trades places with Pluto and becomes the ninth planet.
Then,it switches back. Neptune is almost a twin of Uranus. Neptune has 4 very
light rings. Neptune has 8 moons, the largest is Triton. Triton is the coldest
object in the Solar System. Neptune is about 2.8 billion miles from the sun. Its
temperature is 400 degrees below zero! It is about 3.8 times as wide as the earth, but
only weighs 17 times the earth. Neptune is one of the "gas giant" planets
consisting of a deep surface, liquid surface, and sometimes solid core.
Neptune's atmosphere is mostly hydrogen and helium, but it has methane which
makes the planet look blue. A huge storm
always blows there. People call it the Great Dark Spot. It covers an area the size
of Earth! The inner core contains the most rock and metal of the gas
giant planets. A magnetic field is present on Neptune. Neptune completes one revolution
every 16 hours and orbits the sun every 164.79 Earth years. If Neptune does not go around
the sun while you are alive, your grandchildren or great-grandchildren might be lucky
enough to see it.