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1. Review "Kepler's Second Law" lab in Mastering Astronomy. State Kepler's Second Law, and describe what you observe about the green shaded region. Is a planet's orbital speed constant? What did Kepler observe about the orbit of Mars that helped him conclude its orbit is elliptical?

2. Briefly describe the Ptolemaic and Copernican models of the solar system. What was the basic flaw of the Ptolemaic system? Is the Copernican model also flawed? If so, in what way?

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