Jupiter’s red great Spot is the largest atmospheric vortex recorded in the Solar System. This vortex was discovered more than 350 years ago, it is constantly changing in size.
At the very beginning, when observations began, the Red Spot already measured about 40 thousand kilometers in length and 13 thousand kilometers in width. Since the 1930s, its size has been decreasing: in 1979 it was 23,300 km, in 2014 – 16,500 km.
The wind speed is calculated inside the spot, it exceeds 500 kilometers per hour.