(Updated Dec. 2017) The very bright star, Deneb, which is the tail of the swan in the constellation Cygnus, is just outside the field of view in this image.  The colors are “false”, as is usually the case with narrowband images, but perhaps especially so here, since the real color would be predominantly red because there is so much hydrogen.  Instead, the H-a channel was used as luminence (defining the brightness of each pixel), while the S-2 channel is assigned to red and the O-3 channel to both blue and green. The image was captured at Wa-chur-ed Observatory in June […]