Sh2-188 in Cassiopeia
The image is of Sharpless 2–188 (Sh2-188), an unusual planetary nebula located in the constellation Cassiopeia. The expanding gas from the planetary nebula is colliding with ambient gas in the interstellar medium. The nebula is nearly circular in shape but is much brighter to the southeast (lower right) because the central star is moving rapidly in that direction. Faint wisps of gas can also be seen in the opposite direction. The central star is blueish start just below the bright orange star in the center of the nebula.