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An axial tilt of 98 degrees causes extreme seasons lasting over 20 years. The figure is taken from ESA, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.

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Yes. It sits on the Space shelf, one of 1,090 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.

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Mondo Knows Facts

Uranus rotates almost entirely on its side

An axial tilt of 98 degrees causes extreme seasons lasting over 20 years

Uranus has an axial tilt of about 98 degrees, meaning it rotates almost perpendicular to its orbital plane around the Sun. Scientists suspect a massive collision with an Earth-sized protoplanet early in solar system history knocked the ice giant sideways, producing extreme 21-year-long seasons.

Where this comes from

ESA

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Tags: uranus, rotation, tilt

Uranus rotates almost entirely on its side: the short answers

Where does this come from, and can I check it?: An axial tilt of 98 degrees causes extreme seasons lasting over 20 years. The figure is taken from ESA, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.
Is this really a space fact?: Yes. It sits on the Space shelf, one of 1,090 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.
What else can I read about it?: The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.