M17, NGC 6618, Swan Nebula

astronomy celestial body checkmark nebula composite image deep sky deep space digitized sky survey dss infrared array camera infrared images interstellar cloud irac lobster nebula m17 messier 17 mips multiband imaging photometer nebula ngc 6618 omega nebula o stars science spitzer space telescope mission sst mission star formation stellar behemoth super hot stars swan nebula