* Venus: Venus rotates in the opposite direction of most planets in our solar system, a phenomenon known as retrograde rotation. It also rotates incredibly slowly, taking about 243 Earth days to complete one rotation, which is longer than its orbital period around the Sun (225 Earth days). This means a day on Venus is longer than a year on Venus.

* Uranus: Uranus rotates on its side, with its axis of rotation tilted at almost 90 degrees to its orbital plane. This means its poles point almost directly at the Sun, resulting in extreme seasonal variations. It's thought this unusual tilt might be due to a collision with a large object in the early solar system.