
simple.png texture has been created by Tomasz Buchert (tomasz.buchert@inria.fr)
using a picture of "Double Cluster in Perseus" provided by Fabian Neyer
(fabian.neyer@gmx.ch) under "Attribution-ShareAlike 3.0 Unported" license.

The original picture is available at:

   * http://apod.nasa.gov/apod/ap140123.html
   * http://www.starpointing.com/ccd/ngc869_ngc884.html
