Jupiter has the shortest day of all the planets. It turns on its axis once every 9 hours and 55 minutes. The rapid rotation flattens the planet slightly, giving it an oblate shape.
The Great Red Spot is a huge storm on Jupiter. It has raged for at least 350 years. It is so large that three Earths could fit inside it.
Jupiter is swarming with at least 67 moons in orbit around it, the largest number of natural satellites around any of the planets. Jupiter’s 4 largest moons; Ganymede, Callisto, Io and Europa are known as the Galilean Moons, named after their discoverer Galileo Galilei. They were also observed at about the same time by astronomer Simon Marius.
One of the Jupiter’s moon is believed to grow and shrink because water beneath on its frozen surface