What was the likely external trigger for the collapse of the solar nebula?

Answer

A nearby event such as a supernova shockwave

The gravitational collapse that formed the protosolar nebula was likely initiated by an external perturbation, such as the shockwave generated by a nearby supernova.

What was the likely external trigger for the collapse of the solar nebula?

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What Was The Composition Of The Solar Nebula? - Physics Frontier

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