In the halo, we do NOT find:
A) tidal streams.
B) globular clusters.
C) small satellite galaxies.
D) spiral arms.
E) old white dwarfs.
Question 2
Why do researchers believe that asteroids in the asteroid belt are primal rocks that did not merge into a planet?
A) The total mass of the asteroids in the asteroid belt is much smaller than that of any terrestrial planet in our solar system.
B) The differences in chemical compositions of the asteroids are too large for them to have originated in a single body.
C) Jupiter's gravity could have prevented these objects merging into a single body.
D) All of the above.
E) None of the above.
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