Thinkquest 2001

Game

Neptune
Welcome to The Planet of Neptune.

Information about Neptune
Mass
kg 1.02 x 10^26
Diameter
km 30,700 mi.(49528 km)
Mean Density
kg/m^3 1,640
Escape Velocity m/sec 23,300
Distance from the sun Shortest 2,774,800,000 mi.(4,465,600,000 km)
Greatest 2,824,000,000 mi.(4,546,100,000 km)
Mean 2,798,800,000 mi.(4,504,300,000 km)
Rotation Period (Length of Day) Earth Hours 19.1
Revolution Period (Length of Year) Earth Years 164.8
Obliquity (Tilt of Axis)
Degrees 29.6
Orbit Inclination
Degrees 1.77
Orbit Eccentricity
Deviation From Circular 0.009
Mean Surface Temperature
Fahrenheit -353 F
Visual Geometric Albedo
Reflectivity 0.51
Atmospheric Components 74% hydrogen(H), 25% helium(He), and methane(CH4)
Rings Rings are narrow, and contain concentrations of particles called ring arcs
Number of Satellites 8

Interesting Facts
Johann Galle discovered Neptune on Sept. 23, 1846
There is a Great Dark Spot on Neptune, a storm system as large as the Earth, spinning round once every sixteen days made of frozen methane
Neptune's axis is tilted at 28 degrees
Neptune has no solid surface
Neptune may have a small core of molten rock at its very center
The center of Neptune is extremely hot: its temperature 7,000 C
Neptune's largest moon is Triton, the coldest in the solar system
Neptune has a thick atmosphere composed of hydrogen, helium, methane, and ammonia, and a relatively low density