Located in the direction of constellation Cassiopeia is an enchanting "bubble" which is actually one of three shells of gas surrounding a massive central star. This shell is the result of a
powerful flow of gas - known as stellar wind - generated by this star (SAO 20575). This star is between 10 and 20 times the mass of our sun and the pressure created by this stellar
wind forces the surrounding interstellar material outwards into this bubble-like form.
This image was mapped in the Hubble palette (SII Ha OIII) with color modifications performed during processing.