A day on Venus lasts longer than a year because it takes 243 Earth-days to rotate once on its axis. In comparison, the planet's orbit around the Sun, i.e. its year, takes only 225 Earth-days. As for Uranus, it is one of the strangest planets in the Solar System. Scientists think that something huge smashed into it billions of years ago and knocked it on it’s side. Other planets look like spinning tops as they make their journey around the Sun, but because Uranus is flipped on it’s side, it appears to be rolling around the Sun. This has a dramatic effect on the seasons on Uranus, as one side is pointed towards the sun for half the orbit around the sun but pointed away for the other half of the orbit. It takes Uranus 84 Earth-years to orbit the sun, so that’s 42 Earth-years of summer... But also 42 Earth-years of winter too!