The accompanying movie shows the Saturn white spot, a great storm in the equatorial region of Saturn, discovered by amateur astronomers in September, 1990. Such storms are rare: the last one in the equatorial region occurred in 1933. The movie contains one complete rotation of Saturn. The storm extends completely around the planet, in some places it appears as great masses of clouds and in others as well organized turbulence.
Credit: Dana Berry/STScI
Publication: January 17, 1991