Geology Section 26.2 Homework: Observing the Solar System: A History: Due Friday, 2/3/12
Read Section 26.2, pages 577-581. Answer the questions that follow.
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Last Name, First Name *
Period (Do not put nd, rd, or th after the number!) *
Explain the retrograde motion of Mars and how the motion of Mars led early scientists and theologians to believe that the Universe was Earth-centered. *
Who proposed the idea of epicycles in a geocentric system? *
Planets sweep out equal areas in equal times. This is a statement of *
To find the period of orbit of a planet (time in years it takes to go around the Sun), you would *
Mars is 1.5 astronomical units from the Sun. How long will it take Mars to go around the Sun in Earth years? *
Define an astronomical unit. What is it and why is it an easier unit to use when measuring distances in the solar system? *
What law describes the reason that planets continue to travel around the Sun without any apparent propulsion? *
Read the article on page 581 about Galileo. Summarize Galileo's major contributions to science in a short paragraph. You must cite at least 3 contributions to be worthy of an A on this one. *
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