What is the source of luminosity for protostars that have not yet become hot enough for fusion in their cores?
A)fusion in their low- density outer layers
B)light absorbed from nearby stars
C)energy released by infalling matter
D)fission from concentrated radioactive elements

Question

Quizplus · Accepted Answer

The source of luminosity for protostars that have not yet become hot enough for fusion in their cores is the release of energy through the infalling matter onto the protostar's surface. This energy is converted into thermal energy, causing the protostar to heat up and radiate light.

What Is the Source of Luminosity for Protostars That Have