Why do planets orbit at the same level as each other?

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By that, I mean, why do planets always orbit… horizontally(?) around the sun. Why not vertically? Space is a 3D space, I’d course. So why would the planets not end up going up as well as sideways?

Edit: Space science is a lot more complicated than I thought, and I am here for this rabbit hole. Ty everyone for your answers so far!

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Anonymous 0 Comments

all the planets formed from the same spinning, collapsing cloud of gas that the sun formed from. so the starting conditions made it such that every body that formed from that cloud has the same rotation and orbital plane. the only reason anything is different is the 5 billion years of gravitational interactions and collisions that have happened since.

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