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A solar system forms out of a large cloud of dust; as the cloud starts to rotate as it collapses in on itself, it tends to spin into a disc shape. The center starts coalescing and getting dense enough to turn into a star, and clumps all along the disc coalesce into planets.

The reason why the cloud collapses in on itself, rotates, creates clumps that turn into the star and planets is all because of GRAVITY.

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