Which of these statistics is NOT useful for mapping the locations and shapes of the spiral arms of the Milky Way Galaxy?
A) distribution of globular clusters
B) distribution of O and B stars
C) distribution of emission nebulae (H II regions)
D) distribution of giant molecular clouds

Question

Quizplus · Accepted Answer

Globular clusters are old and distributed in a halo around the Milky Way, not associated with the spiral arms, making them not useful for mapping the locations and shapes of the spiral arms.

Which of These Statistics Is NOT Useful for Mapping the Locations