Why are O and B stars good tracers of spiral structure?
A)They are young and luminous.
B)They are old and have been part of the galaxy for a long time.
C)They are young and moving with large radial velocities.
D)They were formed in the galaxy's halo.

Question

Quizplus · Accepted Answer

O and B stars are young and luminous, making them easy to identify and observe. They are also found mostly in the spiral arms of galaxies, making them good tracers of spiral structure. Their high luminosity and short lifetimes also make them useful in studying the structure and evolution of galaxies.

Why Are O and B Stars Good Tracers of Spiral