The methane in Neptune's atmosphere causes it to be blue.

The outermost gas giant in our solar system. For the years 1979 to 1999, it is actually the outer most planet in the solar system since Pluto has such an eccentric orbit that it crosses over to be inside Neptune's orbit during those years. Neptune is a dynamic world with cloud features and cyclonic storms, somewhat similar to those of Jupiter and Saturn. Unlike Jupiter and Saturn, Neptune possesses a composition which contains many more icy substances such as methane and ammonia. Neptune has eight moons, most of which are small rocky bodies. Triton, however, is an interesting world in its own right. It possesses a complex set of seasons and has a particularly fascinating form of icy volcanism taking place on its surface.

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Equatorial diameter 49528000 mClip
Average Density 1710 kgm-3Clip
Axial tilt 28.8 degreesClip
Rotational period 16.12 hoursClip
Average surface temperature -220 CClip
Maximum apparent magnitude 7.8 Clip
Aphelion 4537000000000 mClip
Perihelion 4456000000000 mClip
Orbital tilt 1.77 degreesClip
Orbital period 164.79y y=Earth year, d=Earth dayClip
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See also: Earth, Jupiter, Major Planets, Mars, Mercury, Pluto, Saturn, Solar System, Sun, Uranus, Venus.

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Subjects: Astronomy Physics

NASA Photographic Library Photographs from NASA available for viewing and download.
The Nine Planets A Multimedia Tour of the Solar System: one star, eight planets, and more.