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 How Many Universes Exist? A Tour Of The International Space Station Saturn’s Largest Moon: Titan Where NASA Believes Extraterrestrial Life May Be Found 10 Scary Yet Beautiful Facts About Space & Us