Our universe- nebulae (Introduction)
by David Turell 
, Friday, November 04, 2011, 00:52 (4747 days ago)
http://blogs.scientificamerican.com/basic-space/2011/10/31/spooky-nebulae-ghosts-snakes...
Gorgeous pictures, thanks to Hubble
Our universe- Hubble tricks
by David Turell , Saturday, November 05, 2011, 17:14 (4745 days ago) @ David Turell
http://blogs.scientificamerican.com/basic-space/2011/10/31/spooky-nebulae-ghosts-snakes...
Gorgeous pictures, thanks to Hubble
Cosmologists' tricks using hubble and galaxy lensing
http://www.physorg.com/news/2011-11-hubble-disc-black-hole.html