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 Five Real Possibilities For Traveling To Other Solar Systems Deep Universe: Hubble’s Universe Unfiltered Top 10 Facts – Space [Part 3] Scale Model Of The Solar System Built In The Desert