File:Ab30 rgb1.jpg

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English: Abell 30 at the prime focus of the 4-meter Mayall telescope at Kitt Peak National Observatory:

Red=Hydrogen alpha;

Green=[O III] 5007;

Blue=6100 Angstrom continuum (just shows the stars).

Stars look "white" because they show up in all three filters. (Logarithmic scaling.)
Source http://violet.pha.jhu.edu/~wpb/abell30/ab30.html http://violet.pha.jhu.edu/~wpb/abell30/ab30_rgb1.jpg
Author William P. Blair
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http://violet.pha.jhu.edu/~wpb/abell30/ab30.html

Public domain This work has been released into the public domain by its author, William P. Blair. This applies worldwide.
In some countries this may not be legally possible; if so:
William P. Blair grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.

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current23:15, 28 September 2013Thumbnail for version as of 23:15, 28 September 2013796 × 796 (804 KB)Fabian RRRR (talk | contribs){{Information |Description ={{en|1='''Abell 30''' at the prime focus of the 4-meter Mayall telescope at Kitt Peak National Observatory: Red=Hydrogen alpha; Green=[O III] 5007; Blue=6100 Angstrom continuum (just shows the stars). Stars look "...

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