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How big is a protostar?

Question:

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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Protostar: Definition, Formation & Facts

from Intro to Astronomy: Help and Review

Chapter 16 / Lesson 7
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