Our universe- nebulae (Introduction)
by David Turell 
, Friday, November 04, 2011, 00:52 (4769 days ago)
http://blogs.scientificamerican.com/basic-space/2011/10/31/spooky-nebulae-ghosts-snakes...
Gorgeous pictures, thanks to Hubble
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David Turell,
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- Our universe- Hubble tricks - David Turell, 2011-11-05, 17:14