Neptune

Part I of Essay
is the outermost planet of the gas giants. It has an equatorial diameter of 49,500 kilometers (30,760 miles) and is the eighth planet from the sun. If were hollow, it could contain nearly 60 Earth's. orbits the Sun every 165 years. It has eight moons, six of which we ....

Part II of Essay
.... and methane. The outer third is a mixture of heated gases comprised of hydrogen, helium, water and methane. The atmospheric composition is 85% Hydrogen, 13% Helium, and 2% methane. The planet's atmosphere, particularly the outer layers, contains substantial amounts of methane gas. Absorption of red light by the atmospheric methane is responsible for Neptune's deep blue color. Neptune is a dynamic planet with several large, dark spots reminiscent of Jupiter's hurricane-like storms. The largest spot, known as the Great Dark Spot, is a ....