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? Scale Model Of The Solar System Built In The Desert Why Was The Apollo Program Cancelled? Why Do We Only See One Side Of The Moon? Virtual Tour To The Sun