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The three stars in Orion's belt, along with Sigma Orionis and the Orion Nebula cluster, along with several other young clusters and star forming regions in the central Orion region are all part of the Orion OB1 association at a distance of 350-420 pc. A review of Orion OB1 can be found in Bally (2008). The three belt stars are probably a similar age and ...

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