Good tracers of the spiral arms of our galaxy are all

Question

Quizplus · Accepted Answer

Tracers of the spiral arms are objects that are concentrated in the arms and can be used to map their locations. Two good tracers are molecular clouds and HII regions. Both of these tracers are found in the interstellar medium and are directly associated with star formation. Molecular clouds are particularly good tracers, as they are the birthplaces of stars and are found throughout the spiral arms. HII regions, on the other hand, are ionized gas clouds that are formed by the intense radiation of young, hot stars. These regions are also found mostly within the spiral arms of the galaxy. Therefore, choices II and III (molecular clouds and HII regions) are the best tracers of the spiral arms of our galaxy.

Good Tracers of the Spiral Arms of Our Galaxy Are