Bill Metallinos - The Bubble Nebula & M52 Scorpion Cluster NGC 7635, also called the Bubble Nebula, Sharpless 162, or Caldwell 11, is a H II region emission nebula in the constellation
The Bubble Nebula & Open Cluster M52
The Bubble and M52
NGC 7635 o Bubble Nebula con ammasso M52 - Associazione Astrofili ASTRIS
Bubble Nebula e ammasso aperto M52 - Coelum Astronomia
M52 and the Bubble Nebula | NOIRLab
M52 & The Bubble Nebula, NGC7635 | Amateur CCD Astronomy
Gruppo Astrofili di Piacenza – NGC7535 “Bubble nebula” – M52 ammasso stellare