Put simply, they started out that way and kept going.
The Only Planet That Rotates Clockwise - WorldAtlas
Is the rotation speed of each planet the same? Is it the circumference of the planet which causes the length of the day? - Quora
Astroquizzical: Do all planets rotate in orbit around their stars?, by Jillian Scudder, Starts With A Bang!
Why Do All The Planets Orbit In The Same Plane?
New Decadal Survey Identifies Priority Planetary Science Missions
Why are all the planets in the same plane? - Quora
Orbit (Revolution) and Rotation of the Planets
Venus, Clockwise Rotating Planets
The Solar System, Outer and Interstellar Space Wiki
Why are all the planets in the same plane? - Quora
David Pogue on X: You know those diagrams of the planets in our solar system? I always figured they were shown on a flat plane to make the diagram clear on the
Do planets stay on the same path when orbiting the sun, or do they move on a Y axis? - Quora
The stable retrograde orbit of the Bee-Zed asteroid explained
Why do galaxies and planets gravitate in a horizontal plane
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