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Good Tracers of the Spiral Arms of Our Galaxy Are

Question 2

Multiple Choice

Good tracers of the spiral arms of our galaxy are all
I.very old.
II.very young.
III.very luminous.
IV.moving with large radial velocities.

A) I & III
B) I & IV
C) II & III
D) II & IV
E) I, III, & IV

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