What event is widely believed to have triggered the initial collapse of the solar nebula?
Answer
Shockwave from a nearby supernova
Many astronomers suggest that the compression needed to initiate the gravitational collapse of the calm gas cloud came from the shockwave generated by a nearby star ending its life in a supernova explosion.
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Formation of the Solar System - The Solar Nebula theory Explained
Formation of the Solar System | The Dr. Binocs Show - YouTube
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