NGC 281 is commonly known as the Pac-Man Nebula for its resemblance to the video game icon. It is a H II region located in the constellation of Cassiopeia at a distance of approximately 9,600 light years. The visible structure of the nebula spans a distance of approximately 60 light years. A young open star cluster, IC 1590, is located in the center of NGC 281. The brightest member star, HD 5005, is the primary ionization energy source for the surrounding H II region. As in the Eagle Nebula, the Pac-Man contains several pillars and dark Boc Globules. These areas are active stellar nurseries where new stars are being created. An impressive dust band that forms the mouth of the Pac-Man transverses the lower portion of the nebula. Dr. Robert Gendler published a very informative article describing, in some detail, the Pac-Man Nebula.
A full narrowband (SII/Ha/OIII) Hubble Palette version the NGC 281 may be viewed here.
2Lowell Observatory: https://lowell.edu/deep-space-spotlight-ngc-281-the-pacman-nebula/
3Dr. Robert Gendler: http://www.robgendlerastropics.com/NGC281text.html