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 Pluto And Its Moons Documentary Live! – View Of Earth From The Space Station Why Is The Solar System Flat? Scale Model Of The Solar System Built In The Desert Why Was The Apollo Program Cancelled?