What common event is theorized to have triggered the initial gravitational collapse of the massive, dispersed solar nebula?

Answer

A shockwave from a nearby supernova

Common theories suggest that the initial gravitational collapse of the dispersed material was triggered by a shockwave emanating from the explosive death of a massive star (a supernova) compressing regions within the cloud.

What common event is theorized to have triggered the initial gravitational collapse of the massive, dispersed solar nebula?

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