Protostars
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| definition | A stage in the process of star formation, after the gravitational collapse of the dense pre-stellar core and before the initiation of nuclear fusion in the central object which will eventually become a star. Protostars are classified into four groups: Class 0, Class I, Class II, and Class III. | ||||||||||||||||||||||||||
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| contributor | AAS_Frey.Katie_Admin original | ||||||||||||||||||||||||||