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

Name: Good tracers of the spiral tracers are all I. very old. II. very young. III. very luminous. IV. moving with large radial velocities.
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Quizplus · Accepted Answer

Very young and very luminous objects, such as O and B type stars, are good tracers of spiral arms in galaxies because they are short-lived and thus found near their birthplaces in the spiral arms.

Good Tracers of the Spiral Tracers Are All