Home > Space > Why Do The Planets Orbit In A Plane? Why Do The Planets Orbit In A Plane? Space Share on Pinterest Within about 10 degrees the planets in our solar system orbit in roughly the same plane. So why does that happen? Why did our solar system (and Milky Way) turn out flat? Share on Pinterest Related Posts 25 Facts About Saturn’s Rings National Geographic 2019 | The Biggest Scientific Discoveries of 2019 Documentary Top 10 Facts – Space [Part 8] Asteroid Mining Why Do We Go to Space?