Why does Uranus rotate on its side?
Quick Answer
Uranus’ extreme tilt is usually explained by a giant impact early in its history, though multiple impacts or interactions may also have contributed. Its axis is tilted by about 98 degrees.
The Full Story
Uranus is tipped nearly on its side, with an axial tilt of about 98 degrees, meaning it effectively rolls around the Sun. The leading explanation is that a massive collision early in Solar System history knocked the planet over after it formed. Some scientists also consider the possibility of several smaller impacts or gravitational interactions with a large disk of material. This unusual tilt gives Uranus extreme seasons, with each pole facing the Sun for about 21 years at a time.
Key Facts
YouTube Angle
Suggested video title for this topic:
"Uranus didn’t just tilt a little—it practically rolled over."