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1.The birth of our solar system began as dust and gases(nebula) started to gravitationally collapse. 2.The nebula contracted into a rotating disk that was heated by the conversion of gravitational energy into thermal energy. 3.Cooling of the nebular cloud caused rocky and metallic material to condense into tiny solid particles. 4.Repeated collisions caused the dust-size particles to gradually coalesce into asteroid-size bodies. Within a few million years these bodies accreted into the planets.
