Why do the planets in the solar system orbit on the same plane?

Highlights From the SpaceX Inspiration4 Astronauts’ Splashdown. The mission went to an altitude of 366 miles, higher than the International Space Station and the Hubble telescope, and an orbital speed of more than 17,000 miles per hour. Its crew of amateur astronauts spent three days in orbit.

Trailblazing tourist trip to orbit ends with splashdown

SpaceX's Inspiration4 Returns After 3 Days in Orbit