The planet that has a big red spot is Jupiter. The Great Red Spot is a persistent high-pressure region in the atmosphere of Jupiter, producing an anticyclonic storm that is the largest in the Solar System. It is a long-lasting area of high pressure on Jupiter creating a persistent storm. The Great Red Spot is generally reddish in color, slightly oval in shape, and rotates counterclockwise once about every six days, producing winds up to 580 mph (933 kph) . The storm has been visible for centuries and is the largest known storm in the Solar System, with a diameter of 15,400 miles, almost twice the size of the entire Earth and one-sixth the diameter of Jupiter itself. The Great Red Spot is not anchored to any solid surface feature, and it may well be the equivalent of a gigantic hurricane.