Why does the rotation of a protostar slow down over time?
A)All rotating objects slow down over time.
B)Magnetic fields can transfer angular momentum to the protostellar disk and protostellar winds can carry angular momentum away.
C)The onset of fusion causes the rotation rate to slow dramatically.
D)Magnetic fields of other stars interact with the magnetic fields of the protostars,slowing its rotation.

Question

Quizplus · Accepted Answer

As a protostar forms, it accretes gas and dust from a disk around it, which causes it to spin faster. However, magnetic fields can transfer angular momentum from the protostellar disk to the surrounding material. Additionally, protostellar winds can carry away some of the protostar's mass and angular momentum, causing it to slow down over time. The onset of fusion, as mentioned in choice C, actually causes the protostar to spin faster, not slower. The magnetic fields of other stars, as mentioned in choice D, might have some effect on a protostar's rotation, but it is not the primary reason for the rotation to slow down.

Why Does the Rotation of a Protostar Slow Down Over