Imagine that we take a picture of a large nearby

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13. Imagine that we take a picture of a large, nearby galaxy and find that we can see the bright bulge in its middle but only faint traces of its spiral arms. Which power of our telescope needs to be improved to see more of the spiral arms? (a) light-gathering power (b) magnification (c) adaptive optics (d) resolution (e) sensitivity to X-rays 14. Let's say you bring Dr. Reid a nice red apple and place it on the desk in his office. Why does the apple look red? 15. Which form of light has the highest speed ? AST 201 MIDTERM 1, FALL 2012 PAGE 5 OF 10
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16. What causes stars to twinkle? 17. The graph below shows the spectrum of a celestial object (wiggly line). An idealized model of this object is also shown (smooth line). The two vertical dashed lines indicate the width of the visible part of the spectrum. Which of the following best describes the kind of object which is responsible for producing the overall shape of this spectrum, as represented by the idealized model? (a) A thin, cool cloud of gas (b) The surface of a cold planet (c) A room-temperature plasma (d) A star with a surface temperature of 60,000 K (e) A very dense cloud of mainly hydrogen AST 201 MIDTERM 1, FALL 2012 PAGE 6 OF 10
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18. Johannes Kepler realized that one could explain the observed motions of the planets by imagining that they moved in elliptical orbits around the Sun. What was his likely motive for making this change?
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