Which planet has the most extreme axial tilt?

Uranus is the planet with the most extreme axial tilt, tipping about 98 degrees relative to its orbit. That means it effectively rolls around the Sun on its side. The unusual tilt likely resulted from a massive impact early in the planet’s history. As a result, Uranus has very unusual seasons, with each pole facing the Sun for long stretches during its orbit. This tilt makes Uranus one of the most distinctive planets in the Solar System.