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Abell 21
Abell 21, aka the Medusa nebula, is found in the constellation Gemini. Abell 21 is a large old planetary nebula whose emission is powered by radiation of a blue star, which can be seen in the upper 1/3 of the nebula’s image. Image taken with a Takahashi Epsilon 180 f/2.8 astrograph and a modified Canon 40D.
The_Bubble_SH2_162_NGC_7635_in_Cassiopeia.jpg NGC_291_in_Cassiopeia.jpg Medusa_Nebula_in_Gemini.jpg Flame_Nebula.JPG Comet_PanSTARRS_14_March_2013.jpg
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