- Dec 4, 2017
The planets in our Solar System spin because of the Sun spinning around itself, and it drags the planets to spin in the same direction from left to right, with the exception of Mercury and Venus: they stopped their axial rotation when they lost their internal heat, and the turn is for Earth to stop its spinning after about 1000 years.All planets in our Solar System spin in a prograde motion, except Venus and Uranus, which spin in a retrograde motion. Uranus is lying on its side - its axis of spin is parallel to the plane of the Solar System. On Venus and Uranus, the Sun rises in the west and sets in the east.
So Venus and Mercury appear to move retrograde, like our Moon which apparently moves retrograde, while in reality, it does not spin around itself.
About Uranus, its axis tilt makes it spin in a plane about horizontal.
This is to let sun rays fall on a certain region to become warm: so as to bear life maybe: because Uranus is far away in distance from the Sun.