A Galaxy Hidden in Plain Sight

There are times when I glance at an image and right away I know something is peculiar about it. Such was the case for UGC 477, the very lovely but decidedly weird galaxy pictured above. The image was taken using Hubble Space Telescope, and only shows two colors; usually these images are the more natural-looking three-color red/green/blue composites. In this case, what you see as blue is actually at a wavelength of 475 nanometers (teal or blue-green to our eyes), and red is 775 nanometers, just a...