quiz 1.doc - Astronomy 100 Unit 1 Quiz How did Kepler resolve the issue of epicycles a He improved the heliocentric model of Copernicus by changing the

quiz 1.doc - Astronomy 100 Unit 1 Quiz How did Kepler...

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Astronomy 100, Unit 1 Quiz How did Kepler resolve the issue of epicycles? a. He improved the heliocentric model of Copernicus by changing the circles to ellipses. b. He combined the Copernican and Ptolemaic models, keeping the best parts of each. c. He improved the geocentric model of Ptolemy by adding additional cycles. d. He completed the model that Tycho Brahe had started to develop. A star is moving toward the Earth . What can you say about the wavelength of the H-alpha absorption line (656.3 nm) that you would detect in the star's spectrum? a. It would be more than 656.3 nanometer. b. It would be less than 656.3 nanometer. c. It would remain at 656.3 nanometer but have higher amplitude than normal. d. It would remain at 656.3 nanometer but have lower amplitude than normal. Suppose you see a white star and a yellow star through binoculars. What can you conclude, assuming no Doppler shift is present? a. The white star is more massive than the yellow star. b. The white star has a higher surface temperature than the yellow star. c. The yellow star is more massive than the white star. d. The yellow star has a higher surface temperature than the white star. How did the Ptolemy explain the apparent retrograde motion of the planets? a. He held that the planets moved along small circles that moved on larger circles around the Sun. b. He held that sometimes the planets moved backward along their circular orbits. c. He varied the motion of the celestial sphere so that it sometimes moved backward. d. He held that the planets moved along small circles that moved on larger circles around the Earth.
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