The Bubble Nebula is located 7,800 light-years from Earth towards the constellation Cassiopeia.
NGC 7635 is surrounded by a vast HII molecular cloud that glows red as hydrogen atoms are ionized. Young stars are forming in some of the globules depicted in this image. These globules form as parts of the molecular cloud collapse and continue to contract under their own gravitational force. — Ryan Hannahoe and Salvatore Grasso