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What occurrence defines the end of the protostar phase of a star's life and the start of the main-sequence phase?
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What occurrence defines the end of the protostar phase of a star's life and the start of the main-sequence phase?

User ThoFin
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When the cloud of nebula gasses is shot outward as the star ignites, this also slows any development of planets or the likes.
User Johannes Sasongko
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