A stage 4 protostar may temporarily be thousands of times more luminous than the Sun.

Question

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During the stage 4 of protostar formation, the protostar begins to collapse and heat up, leading to the ignition of nuclear reactions in its core. This results in a temporary increase in luminosity, which could make it thousands of times more luminous than the Sun. During the stage 4 of a protostar's formation, gravitational contraction heats up the core and the protostar emits a large amount of radiation, which can make it temporarily thousands of times more luminous than the Sun.

A Stage 4 Protostar May Temporarily Be Thousands of Times