Early in its lifetime a 1-M ? protostar will have 100 times the Sun's luminosity. How is this possible?

Question

Quizplus · Accepted Answer

The luminosity of a star is greatly influenced by its size. Even though a protostar's initial temperature is relatively low compared to later stages, its large radius can result in a higher luminosity. This is because the luminosity (brightness) of a star increases with both its surface area (which is related to the square of the radius) and the fourth power of its surface temperature, according to the Stefan-Boltzmann law. Early in its life, a protostar can be very large, thus having a high luminosity despite its lower temperature.

Early in Its Lifetime a 1-M ? Protostar Will Have