Which of the following happens as a protostar contracts?

Question

BlackTom AI · Accepted Answer

When a protostar contracts, several interconnected physical changes occur as gravity dominates over pressure. 
Option A: Its temperature rises. During contraction, gravitational potential energy is converted into thermal energy, causing the core temperature to increase. This is a fundamental result of the Kelvin-Helmholtz contraction process. 
Option B: Its radius decreases. Gravitational contraction pulls the outer layers inward, reducing the overall radius of the protostar over time. 
Option C: Its density rises. As the material is compressed into a smaller volume while mass remains roughly constant, the average density increases. 
Option D: All of these are true. Since A, B, and C are correct, this collective statement accurately reflects the outcome of protostellar contraction. 
Option E: Its pressure rises. The inward pull increases the core pressure, contributing to further heating and the eventual onset of nuclear fusion. 
The statements in A, B, C, and E are consistent with the standard picture of protostellar contraction, and therefore the combined assertion in D correctly summarizes the process.

Which of the following happens as a protostar contracts?单项选择题

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