How much of the solar system's mass is in the Sun?
The Sun contains about 99.8% of all the mass in our solar system.
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- How long are seasons on Uranus?
“Each season on Uranus lasts about 21 Earth years.”
Reference: NASA
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Why does Uranus spin on its side?
Uranus is tilted about 98 degrees, so it basically rolls around the Sun on its side.
Are they hibernating or sleeping?
Hibernation is not a deep sleep but, an actual state of dormant existence that can last weeks even months for certain types of animals. The word hibernation came from the Latin word, "wintering".