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nebula interstellar gas clouds outer space space stars astronomy universe cosmos galactic Orion Nebula Messier 42 M42 NGC 1976 diffuse nebula emission nebula ionized gas hydrogen oxygen nitrogen supergiant stars hot young stars stellar winds radiation ultraviolet radiation visible light infrared radiation radio waves microwaves X-rays gamma rays cosmic rays dark matter energy mass gravity magnetism electric fields magnetic fields plasma dust gas molecules atoms subatomic particles quantum mechanics relativity