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

Question

Quizplus · Accepted Answer

The distribution of globular clusters is not useful for mapping the locations and shapes of the spiral arms of our Galaxy because globular clusters are distributed spherically around the center of the Galaxy and do not trace the structure of the spiral arms. The distribution of O and B stars, emission nebulae (H II regions), and molecular clouds are all useful indicators of the spiral arm structure.

Which of the Following Is NOT Useful for Mapping the Locations