The Dumbell Nebula, Messier 27 photographed by an amateur astronomer in Hydrogen alpha and Oxygen III using a telescope with a focal length of 575mm.
<a href="//commons.wikimedia.org/w/index.php?title=User:Stephanh&amp;action=edit&amp;redlink=1" class="new" title="User:Stephanh (page does not exist)">Stephanh</a>
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<span class="int-own-work" lang="en">Own work</span>