rticles. Scientists are not as concerned with this planet. Neptune is the last of the gaseous planets in our solar system. Its atmosphere is much like Uranus's because it is mostly helium and hydrogen. It also contains methane. Neptune has a diameter of 49,500 Km and a mass 17.22 times that of the Earth. It has an average density of 1.67 /cm^3 (Sipiera 160). Neptune also has rings like its other gaseous partners, but they are very faint. Not a great deal is known about Neptune. It is widely studied by scientists and that makes it an important planet. The final planet, which is also the smallest, and the furthest away from the sun, is Pluto. This planet is very hard to see therefore not a lot is known about its physical characteristics. Scientists do know that it has a thin methane atmosphere. Little is known about this planet because it is so far away from the Earth and the sun. Scientists are always learning new things and more data will arise in the future. As one can see the planets of most importance are the ones closest to the sun and Earth. Little is known about the far off planets therefore it is hard to give them full recognition. Much is known about Mercury, Venus, Earth, Mars, Jupiter and Saturn. The other three planets are not as well known as these six are. Whether more planetary systems exist doesn't really matter. There are still plenty of things we don't understand about our own solar system. Scientists will have their work cut out for them in the future. Each and every planet has distinct differences and that helps show us how truly great God is. The planets will never fully be understood and will always be a great topic of discussion....
