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C14Edge, AP900, SBIG ST10XME, Astrodon Ha-OIII-RGB, Optec TCF
NGC 7538 is an emission and reflection nebula near the Cassiopeia - Cepheus border. It is home to the largest known protostar. The Herschel Space Observatory has also identified 13 massive, dense clumps where colossal stars could form in the future, as well as a strange ring of stellar seeds which may be the edge of a bubble carved by previous stellar explosions. NGC 7538 is about 9000 light-years away from Earth.