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Physics 93 Online
OpenStudy (anonymous):

A protostar forms when a ________ collapses under the force of gravity. A. white dwarf B. black dwarf C. nebula D. supernova

OpenStudy (anonymous):

C. Nebuala is an interstellar cloud of dust, hydrogen, helium and other ionized gases. So, when it collapses (& this takes 100s of millions of years), it forms a protostar-a baby star.

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