Whatis a Protostar and How Does It Get Its Energy

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The Answer is A protostar can be defined as a forming star that is compressed enough to be opaque at all wavelengths but not so hot and compressed as to be able to generate energy by nuclear fusion, as would a main-sequence star.
A protostar shines with energy released gravitationally, from a combination of matter falling inward to the protostar, plus slow contraction of the protostar itself.

Whatis a Protostar and How Does It Get Its Energy

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