Jupiter's great stain has been analyzed by the Galileo probe by NASA's Jet Propulsion laboratory astronomer, Kevin Baines.
The stain is a hurricane shaped storm that is double the Earth. The storm is at least 300 years old. Water, the upward flow of ammonia, and other gases constitute the set of clouds that spiral.
The Cassini probe, on its way to the Titane, is expected to pass by Jupiter next year, receive more information.