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"Our planet Earth is part of a solar system that consists of nine (and possibly ten) planets orbiting a giant, fiery star we call the sun. For thousands of years, astronomers studying the solar system have noticed that these planets march across the sky in a predictable way."^^<http://www.w3.org/2001/XMLSchema#string>
<http://science.howstuffworks.com/46010-solar-system-explained.htm>