A day on Jupiter lasts only about 10 hours.
Why it is true
Jupiter is the fastest-rotating planet in the solar system, completing one rotation in about 9 hours and 56 minutes. This rapid rotation causes the planet to be slightly flattened at the poles.
Source: NASA
Would you rather be asked first?
This is the reading side of the site, so the answer is in the sentence above — that is the whole point of it. Test yourself works the other way round: the question comes on its own, and the fact and the explanation only appear once you have answered.
Related facts
Uranus rotates on its side, likely due to a massive collision.
Ganymede, a moon of Jupiter, is larger than the planet Mercury.
Jupiter does not have a defined solid surface, being composed mainly of hydrogen and helium in gaseous and liquid states.
Venus rotates on its axis in the opposite direction to most other planets in the solar system.


