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Orion Nebula infrared light space astronomy stars nebula gas dust Orion's Belt constellation Messier 42 M42 NGC 1976 diffuse nebula emission nebula reflection nebula H II region star formation interstellar medium astrophysics astrophotography space exploration Orion mythology constellations nebulae stars galaxies universe cosmos astronomy science education Orion Nebula infrared light space astronomy stars nebula gas dust Orion's Belt constellation Messier 42 M42 NGC 1976