Dark matter is ___.
A) a cloud of black holes and brown dwarfs in the galactic halo
B) extremely cold, supermassive molecular clouds in the disk
C) an unknown type of mass that does not emit or absorb photons
D) the substance of which black holes are made
E) a theory to explain galactic formation that has been proven wrong
Correct Answer:
Verified
Q25: Q26: Which of the following would be the Q27: The Sun orbits the center of the Q28: Spiral density wave theory and self-sustaining star Q29: O stars must be formed in spiral Q31: _ are crucial in determining the distance Q32: Why is it so difficult to study Q33: In which area of the galaxy would Q34: Spiral arms are obvious-easily-seen features-because they contain Q35: A group of one hundred to a
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