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Wickedsymphony1717 t1_jdcu7jj wrote

They all orbit the sun in the same plane because the sun and the planets all formed from the same gas cloud. That gas cloud that they formed from had a particular angular momentum associated with it (i.e. on average, all the particles were spinning around in a particular direction). When the gas cloud collapsed to form the solar system, the sun and all the planets ended up spinning in that same direction because angular momentum is always conserved.

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Capital_Pair_7161 t1_jdd39ja wrote

To add onto that the particles that weren't traveling on the same plane would bump into each other averaging out the variation of velocities outside of the rotating disc

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