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== Classification ==
[[File:Hot and brilliant O stars in star-forming regions.jpg|thumb|upright=1.2|Hot and brilliant [[O-type main-sequence star]]s in star-forming regions. These are all regions of star formation that contain many hot young stars including several bright stars of spectral type O.<ref name=eso/>]]
{{Further|OB star}}
Main sequence stars are divided into the following types:
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