Jupiter completes one rotation in just 9 hours and 55 minutes, making it the fastest-rotating planet in the Solar System. This rapid spin causes Jupiter to bulge visibly at the equator and flatten at the poles — its equatorial diameter is 9,275 km wider than its polar diameter.
Despite its massive size (1,300 Earths could fit inside), Jupiter's year lasts 4,333 Earth days (about 11.9 Earth years). The planet's Great Red Spot — a storm larger than Earth — has persisted for at least 350 years of Jupiter time.
Frequently Asked Questions
How long is a day on Jupiter?
Jupiter rotates once every 9 hours 55 minutes — the shortest day of any planet.
Why does Jupiter rotate so fast?
Jupiter conserved angular momentum from the rotating cloud of gas and dust it formed from, and has no solid surface to slow it down via friction.
How long is a Jupiter year?
Jupiter takes 4,333 Earth days (about 11.9 Earth years) to orbit the Sun.