... Tonight's Sky . ... Observing . ... Imaging Basics . ... A panoramic loop in Cygnus . ... As an end of the year finale, the National Optical Astronomy Observatory (NOAO) and WIYN partners offer this new wide-field image of the Cygnus Loop.ТљThree degrees on a side, this image covers an area of the sky about 45 times that of the Full Moon.ТљBut it does so without sacrificing high resolution.ТљThe image is more than 600 million pixels in size, making it one of the largest astronomical images ever made...