1
passage IV

31. Which of the following statements best expresses the main idea of the passage?

  • A. Bailin began studying the Sagittarius Dwarf when he was a graduate student in astronomy.

  • B. The gravitational tidal forces of the Milky Way are destroying the Sagittarius Dwarf.

  • C. Most astronomers have come to an agreement that evidence about how galaxies have formed is, at best, circumstantial.

  • D. Evidence suggests that the warp in the Milky Way’s disk results from the Milky Way’s interaction with a small satellite galaxy.