What external trigger can initiate the collapse of a stable nebula?
Answer
The shockwave from a nearby supernova
Nebulae often remain stable for vast periods, held apart by internal pressures. However, a significant external event is required to overcome this stability and initiate gravitational collapse. One recognized catalyst mentioned is the immense energy released by a supernova explosion, whose resulting shockwave can compress regions of the diffuse gas cloud sufficiently for gravity to begin dominating the local forces. The gravitational pull of a passing star is another cited mechanism that can provide the necessary disturbance to begin contraction.
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What Causes A Nebula To Collapse? - Physics Frontier - YouTube
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