What could you use to measure the mass of the dark matter halo in a spiral galaxy?
A) H emission from H II regions in the spiral disk
B) The velocities of satellite dwarf galaxies surrounding a spiral galaxy
C) Absorption lines in the spectra of its globular clusters
D) All of the above
Correct Answer:
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A) they are
Q28: What makes up the majority of the
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Q31: The dark matter in galaxies is _
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