What physical principle is responsible for accretion disks forming around protostars?

Name: What physical principle is responsible for accretion disks forming around protostars?
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Accretion disks around protostars form due to conservation of angular momentum. As the gas and dust from the protostellar cloud collapse towards the center, it gains angular momentum. This angular momentum must be conserved, so the material flattened into a disk-like structure around the protostar.

What Physical Principle Is Responsible for Accretion Disks Forming Around