For over 340 years, we have been watching what may be the solar system's longest lasting storm, Jupiter's Great Red Spot. Since Cassini first discovered it in 1665, after Hans Lippershey invented the telescope in 1608, many have been intrigues with the great gas giant. The high-pressure storm rotates (in the opposite direction from low-pressure Earth hurricanes) due to Coriolis effects (just as on Earth) making a complete rotation every 6 days (2.5 times faster than storms rotate on Earth). Jupiter's fast rotation rate (a 10-hour day) helps drive the storm. See animation of the storm, courtesy of Wikipedia.