This drawing shows how forming planets drew gas to themselves.
Click on image for full size
Image from: The New Solar System
As shown in this picture, while they were forming in the flattened disc of the solar nebula, the nucleii of the planets-to-be (called proto-planets) drew material to themselves from the cloud of gas and dust around them. The bigger protoplanets were able to attract even more gaseous material unto themselves.
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