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Inside Neptune

AstronomyPlanetsScience
Astronomy Table of Contents►
Astronomy Site Index►
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Mercury Mercury Venus Venus Earth Earth Mars Mars Jupiter Jupiter Saturn Saturn Uranus Uranus Neptune Neptune Pluto Pluto
Mercury Venus Earth
Mars Jupiter Saturn
Uranus Neptune Pluto

Neptune inner structure 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.

Other Links:
Neptune
Introduction
Inside Neptune
Rings
Atmosphere and the Great Dark Spot
Moons
Activities & Links
The Planets
Mercury
Venus
Earth
Mars
Jupiter
Saturn
Uranus
Neptune
(Pluto - dwarf planet)
Your weight on the planets
Your age on the planets
The Solar System
— Our Solar System —
The Sun
The Planets
The Moon
Asteroids
Kuiper Belt
Comets
Meteors
Zoom Astronomy
— All About Astronomy —
Table of Contents
Index
More on Astronomy
Stars
Our Solar System
Astronomy Glossary
Hall of Astronomers
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