What can trigger the gravitational collapse of an interstellar gas cloud?
A)a decrease in temperature
B)an increase in density
C)a rise in temperature
D)A and B
E)A and C

Question

Quizplus · Accepted Answer

The gravitational collapse of an interstellar gas cloud can be triggered by both a decrease in temperature (which causes the gas to contract and increase in density) and an increase in density (which causes the force of gravity to become stronger and overcome the gas pressure holding the cloud up). Therefore, both options A and B are correct. Option C, a rise in temperature, would actually work against the gravitational collapse by causing the gas to expand and become less dense.

What Can Trigger the Gravitational Collapse of an Interstellar Gas