One trigger that could start the gravitational contraction of a molecular cloud to form stars is a passing shock wave.

Name: One trigger that could start the gravitational contraction of a molecular cloud to form stars is a passing shock wave.
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Shock waves from events such as supernova explosions can compress nearby molecular clouds, increasing their density and triggering the gravitational collapse necessary for star formation.

One Trigger That Could Start the Gravitational Contraction of a Molecular