Why does the tempincher of a pprotostar increass over time?

Answer 1

The temperature of a protostar increases over time primarily due to the gravitational collapse of the surrounding gas and dust. As the material falls inward, gravitational potential energy is converted into thermal energy, raising the temperature. Additionally, as the density increases, the pressure rises, further contributing to the heating process. Eventually, when the core temperature becomes high enough, nuclear fusion begins, marking the transition to a main-sequence star.