Spiral tracers tend to be old, luminous stars.

Name: Spiral tracers tend to be old, luminous stars.
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Spiral tracers, such as those used to map the spiral arms of galaxies, are typically young, bright stars (like O and B-type stars) or star-forming regions, not old, luminous stars. These young stars are more luminous and easier to observe at great distances, making them ideal for tracing the spiral structure of galaxies.

Spiral Tracers Tend to Be Old, Luminous Stars