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This image from Galaxy Zoo: Bar Lengths is baffling both the researchers and volunteers on the project. There appears to be a well-defined dust lane crossing the face-on galaxy, which is extremely unusual. there is a chance it is a foreground edge-on galaxy with lots of dust, but  there is still no consensus. See what people are saying about it here https://www.zooniverse.org/projects/vrooje/galaxy-zoo-bar-lengths/talk/32/2841/?comment=28012&page=1