Venus rotates in the opposite direction to most of the other planets in our solar system. Looking down on Venus from above its north pole, you would see it rotating clockwise on its axis. Most other planets (except Uranus) rotate counterclockwise.

This is called retrograde rotation. On Venus, the sun rises in the west and sets in the east.

How can this have happened? It may be the result of a titanic collision with a very large and very fast-moving object long ago. A huge comet, coming in from the direction opposite to the motion of Venus could have done it. We know such comets exist, moving in orbits that we also called retrograde, since they circle the sun in a direction contrary to most of the objects in the solar system.