Solar system formation starts with disturbances in a nebula triggering the collapse of gas and dust, forming a protoplanetary disk for planet formation.
Gas and dust in a nebula is disturbed by an outside factor that starts the process of solar system formation. The collapse of the gas and dust within a small patch of the nebula is triggered by the energy and matter released by nearby stars, leading to the formation of a protoplanetary disk where planets eventually form.
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