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The Orion Nebula is a recent star formation place on a sequence of star formation in the Orion Association Ia to Id and further to the Orion Molecular cloud as shown by Kutner, Tucker, Chin, and Thaddeus (1977). From the photoelectric observations, Penston (1973, 1975) obtained the age of the Nebula younger than 3×106years.doi:10.1017/s0074180900073708 fatcat:ywo7mwwxznhdlefpwona4r4raa