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Physics 17 Online
OpenStudy (anonymous):

A protostar forms when a ________ collapses under the force of gravity.A. white dwarfB. black dwarfC. nebulaD. supernova

Miracrown (miracrown):

What do you think? @army_girlfriend0324

OpenStudy (anonymous):

Prototars are formed when nebulas, large clouds of dust and gas, collapse inward do to gravity.

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