Young stellar objects
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| definition | Any star that has evolved past the protostar stage, but has not yet arrived on the main sequence. There is a variety of YSOs depending on their age, mass, and environment, including Herbig stars, T Tauri stars, and, in general, compact infrared sources embedded in molecular clouds. | |||||||||||||||||||||
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| contributor | AAS_Frey.Katie_Admin original | |||||||||||||||||||||