This exceedingly faint nebula was first noticed by Greek astronomers in 2002 Spanning some 4 x 5.5-degrees in the constellation of Pegasus, the object was recently determined to be one of the largest supernova remnants in the Milky Way (https://iopscience.iop.org/article/10.3847/1538-4357/ab5e84). Our mosaic assembles 9 panels of the survey processed to reveal extremely faint structures in Hydrogen-alpha. Note the planetary nebula Abell 74 at the top of the frame. Read the latest