Our Solar System _______________________________________________________________________________________________________________________________________________________________________________________________________________________
7. Rotation
Most planets rotate on an axis, which is almost perpendicular to the plane of its orbit around the Sun.
For Uranus and Pluto, the rotational axes are titled, almost flat to their orbital planes. This means instead of rotating sideways like other planets, they rotate top to down!.
Most planets in our solar system, including Earth, rotate counter-clockwise, but Venus and Uranus are said to have a retrograde or clockwise rotation around their axes.
A day is the time a planet takes to rotate fully on its axis.
This video animates NASA images of all eight planets in our Solar System to show them spinning side-by-side for an easy comparison. In the time-lapse video, a day on Earth -- one Earth rotation -- takes just a few seconds. Jupiter rotates the fastest, while Venus spins not only the slowest, but backwards.