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Table of Contents Enchanted Learning
All About Astronomy
Site Index
Our Solar System Stars Glossary Printables, Worksheets, and Activities
The Sun The Planets The Moon Asteroids Kuiper Belt Comets Meteors Astronomers

Your weight on the Planets The Planets Your age on the Planets
Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune pluto
NEPTUNE

Introduction to Neptune Inside Neptune Neptune's Rings Neptune's Atmosphere and the Great Dark Spot Neptune's Moons Activities, Web Links

INSIDE NEPTUNE
Neptune is composed mostly of ice, hydrogen and helium. It may have a small, rocky core, and an icy mantle that blends into the atmosphere.

Neptune radiates almost three times as much heat energy as it gets from the distant Sun. Some of this excess heat is probably left over from the formation of this planet and some is generated by the slow collapse of the surface because of the planet's own gravitational forces.




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