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by TMark.Bosley
Wed Apr 15, 2009 4:35 am
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: Spiral Structure 101: (APOD 2009 April 14)
Replies: 26
Views: 3316

Re: Spiral Structure 101: (APOD 2009 April 14)

Something I have noticed in many images of spirals. It seems that the lanes of dark dust are on the trailing edge of the arm, while HII regions and/or OB associations are on the leading edge. I would expect the following leading edge-- dust lanes then HII regions trailing edge-- OB associations But ...