http://www.flickr.com/photos/waiferx/3567609008/
Originally uploaded by Waifer X
TireWriter(TM), from Schwinn, demonstrating how density waves create the spiral arm structure of the Milky Way. Massive main-sequence stars are luminous and short-lived, and thus are only seen where their formation is triggered. Video by Cuesta College Physical Sciences Division instructor Dr. Patrick M. Len.
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