Great Red Spot on Jupiter :- the Largest Storm in the Solar System.

The Great Red Spot is a high-pressure region in the atmosphere of Jupiter (largest in the Solar System). It is an Anticyclone which means high speed winds in a High Pressure Area. The Great Red Spot rotates counterclockwise in a period of about six Earth days. 

Robert Hooke and Giovanni Cassini share the credit to observe the Great Red Spot (in 1665) for the 1st time. In 1979, Voyager 1 transmitted the first detailed image of the Great Red Spot. The Juno Mission studied the composition and evolution of the Great Red Spot. 

 The Great Red Spot is located 22 degrees south of Jupiter's Equator producing wind speeds upto 432 km/h Fastest Wind Speed on earth was recorded 408 km/h  during Cyclone Olivia. 

Some predictions say that the Great Red Spot existed since the last 360 years. For comparison, Hurricane John was the longest lasting cyclone on earth (it lasted for about 31 days). The temperature of the atmosphere above the Great Red Spot is 1330°C (about 2400°F). 

The Reason behind the Spot's red colour is still unknown. Some Hypothesis say the red color may be caused by chemical products created from the solar ultraviolet irradiation of ammonium hydrosulfide and the organic compound acetylene. 

 In the 19th Century, the Great Red Spot was measured to be 48,000 km. Voyager spacecrafts showed its length of 23,000 km in 1979. This meant the Spot shrunk into half. As of 2017, the Great Red Spit is about 16,350 km long or 1.3 times the size of earth. At this rate, the storm can vanish in 10 to 20 years (some studies say). The reason behind the shrinking is still unknown.