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- 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 ...