Astronomers compare objects to the mass of the sun, using "solar mass" (Msun) as a basic unit of mass, because objects are so big in space. This stage of stellar evolution may last for between 100,000 and 10 million years depending on the size of the star being formed.

The sun is 1.989 x 10^30 kilograms. A protostar becomes a main sequence star when its core temperature exceeds 10 million K. This is the temperature needed for hydrogen fusion to operate efficiently. The more massive the star, the faster everything happens. Protostar is believed to reach at least 3000 K. Protostar is extremely bright but is not as hot as the sun or other stars. At first, the radiation simply escapes into space. Asked in Astronomy How big is a protostar ? However, as the protostar pulls in matter and gets more dense, much of the radiation becomes trapped inside, heating the protostar even more quickly. Protostar is believed to reach at least 3000 K. Protostar is extremely bright but is not as hot as the sun or other stars.

If the final result is a protostar with more than 0.08 solar masses, it will go on to begin hydrogen burning and will join the main sequence as a normal star. If the protostar can reach a temperature of 10 million degrees kelvin, the hydrogen fusion process will start and it will become an actual star. The length of time all of this takes depends on the mass of the star. An object can be considered a protostar as long as material is still falling inward.

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