spiral with blue ring

• by turelli

  what is the blue ring?

  Posted October 19, 2012 9:54 PM

• by turelli

  http://skyserver.sdss3.org/dr8/en/tools/chart/chart.asp?ra=41.64629338&dec=2.11788406

  Posted October 19, 2012 9:55 PM

• by pmj

  #Blue star forming regions.

  Posted October 19, 2012 10:06 PM

• by turelli

  tks

  Posted October 20, 2012 8:58 PM