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31. Which of the following statements best expresses the main idea of the passage?
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A. Bailin began studying the Sagittarius Dwarf when he was a graduate student in astronomy.
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B. The gravitational tidal forces of the Milky Way are destroying the Sagittarius Dwarf.
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C. Most astronomers have come to an agreement that evidence about how galaxies have formed is, at best, circumstantial.
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D. Evidence suggests that the warp in the Milky Way’s disk results from the Milky Way’s interaction with a small satellite galaxy.