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Orion Nebula star-forming region nebula space astronomy stars gas dust colorful Orion's Belt constellation infrared visible light Messier 42 M42 NGC 1976 horsehead nebula flame nebula dark nebula reflection nebula emission nebula planetary nebula supernova remnant Hubble Space Telescope James Webb Space Telescope NASA ESA science exploration universe mystery Orion mythology culture history religion symbolism art photography painting music literature film television video games education