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Space Fact #147

Uranus rolls around the Sun on its side: 42 years of day, 42 years of night

Uranus is tipped over by almost 98 degrees, so each of its poles gets about 42 years of nonstop sunlight followed by about 42 years of darkness.

October 11, 2026 · 1 min read · 2 sources

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Uranus rolls around the Sun on its side: ___ years of day, 42 years of night

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Most planets spin like a top that leans a little. Not Uranus. It basically lies on its side and rolls around the Sun like a ball rolling across the floor.

A planet knocked over

According to NASA, Uranus is tilted by 97.77 degrees. For comparison, Earth manages about 23 degrees. That puts Uranus’s equator nearly at a right angle to its orbit. From the outside, it looks like someone shoved the planet over.

Nobody knows for sure how it happened. NASA names a possible cause: a collision with an object roughly the size of Earth, a very long time ago. After that, Uranus just stayed down.

Summer for half a lifetime

Uranus takes about 84 Earth years to go around the Sun once. Because it is tipped so far, first one pole and then the other points almost straight at the Sun. That is why, according to Guinness World Records, Uranus holds the record for the longest period of daylight and darkness of any planet in the solar system: each pole gets 42 years of continuous sunlight, followed by 42 years of continuous night.

Imagine being born at the north pole of Uranus just as the Sun comes up. You would be in your early 40s before you saw your first sunset. New Year’s Eve would need some serious planning.

NASA says this gives Uranus the most extreme seasons in the solar system. A single day, one spin around its axis, only takes about 17 hours. At the pole you would barely notice, though, because the Sun just circles the sky instead of setting.

Bonus fact: William Herschel discovered Uranus in 1781 and at first thought it was a comet or a star.

Earth has seasons. Uranus has life stages.

The evidence

  1. 1NASA Science: Uranus: Facts
  2. 2Guinness World Records: Longest period of daylight/darkness on any planet in the Solar System

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5

🎃 The golden pumpkin! Here is your secret Halloween fact:

The first jack-o’-lanterns were turnips. In Ireland and other Celtic regions in the 19th and early 20th centuries, people carved faces into turnips, sometimes potatoes or beets, and put a candle inside. It was meant to keep away the restless spirit “Stingy Jack”, who was barred from both heaven and hell. The National Museum of Ireland in County Mayo still keeps a plaster cast of a carved turnip from Donegal with “a pinched angry face”.

Source: Smithsonian Magazine