How big is a protostar?
Units of Mass in Astronomy
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. The sun is 1.989 x 10^30 kilograms.
Answer and Explanation:
Protostars are very young clouds of dust and particles that will eventually become stars. There are low mass and high mass protostars. Below ~0.08 Msun the core of the protostar will not get hot enough for fusion to occur and the star will become a brown dwarf instead. Above 100-150 Msun the core gets so hot that it becomes unstable.
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Learn more about this topic:
from Intro to Astronomy: Help and ReviewChapter 16 / Lesson 7