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Image submitted by Ian Smith

Narrowband image of ngc7635 , the Bubble Nebula 7,100 LY away in Cassiopeia

A fierce stellar wind from the hot O-type star towards the top of the bubble has blasted out the 7 LY diameter bubble of glowing gas against the denser material in the surrounding molecular cloud. The O-type star SAO 20575 is several hundred times more luminous and 45 times more massive than the sun.

Contains 6 hours of data using Baader Ha/O3/S2 NB filters, 2 hours each filter on Mak-Newt/Atik 460e/NEQ6 and processed in Photoshop CS.