conrad

me and my dad recently got into a heated debated on wether gravity or centrifugal force holds the earth to the sun(or a solar system or a galaxy or a universe). i said that gravity was the major factor, but centrifugal force is a very small factor. he said that centrifugal force is the major factor and gravity is a almost non existent factor. am i wrong?! he felt like i was being sooo stupid with my idea and i vice versa.