From the rocky inner worlds to the gas giants, every planet of our solar system has a fascinating story. Their extreme features give us clues to how the solar system formed—and what hope there may be for life on other worlds. What did the ancient Greeks recognize as the universe? In their model, the universe contained Earth at the center, the Sun, the Moon, five planets, and a sphere to which all the stars were attached. This idea held for many centuries until Galileo’s telescope helped allow people to realize that Earth is not the center of the universe. They also found out that there are many more stars than were visible to the naked eye. All of those stars were in the Milky Way Galaxy.
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