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The spot, which is actually an ancient monster storm that measures about three Earths across, lost 15 percent of its diameter between 1996 and 2006, scientists at the University of California, Berkeley, have found.
Astronomers have observed for years that the clouds of the Great Red Spot have been waning, but this newest research focused on the motion of the storm -- a much more reliable way to measure its size, Asay-Davis said.
What makes it red?
The researchers do not know why the storm is shrinking. In fact, little is known about the Great Red Spot at all. Even the exact cause of its distinctive color is a mystery.

Probes sent by NASA towards the interior of the planet have been crushed by the gas giant's enormous atmospheric pressure. Still, the images of Jupiter and its Great Red Spot mesmerize astronomers.