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Propeller Nebula (Simeis 57) in HSTrgb by Jose Carballada
Via Flickr:
www.astrobin.com/368569 The peculiar nebula Simeis 57. Simeis 57 (also known as HS 191 and C 191) is a high surface-brightness nebula in the constellation Cygnus. The distance nor the source of excitation of Simeis 57 are known.
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