What could you use to measure the mass of the dark matter halo in a spiral galaxy?
A) Hydrogen 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

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The Answer of What could you use to measure the mass of the dark matter halo in a spiral galaxy?
A) Hydrogen 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

What Could You Use to Measure the Mass of the Dark