The Planet Neptunes History
Our solar system formed eight planets, split into two distinct groups of four: the inner planets, rocky and dense, and the outer gas giants. Looked at from afar, one would judge that the gas giants are much more prominent and important. But one of the inner 4 has developed just the right conditions for a life form to arise with the intellect to inquire and theorize about the other planets - and, in fact, to do much more.
All of the gas giants are composed of the same basic elements, mostly hydrogen and helium. Jupiter is discussed in the article Jupiter: Second Biggest Object in the Solar System, but the other giants have unique characteristics that make them at least as interesting.
Saturn
Saturn, of course, is known for its spectacular rings. These remarkable disks of nearly pure water ice are no more than 30 feet thick in some places. Their origin is still a topic for lively debate among astronomers. Two theories have nearly equal numbers of adherents: the rings are simply left over from planetary formation, or they are the residue of a smallish moon that was impacted by a comet and disintegrated.
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