Proper noun
English Wikipedia has an article on:Great Red SpotWikipedia
Great Red Spot
A giant anticyclonic storm on the planet Jupiter, first observed about 1665.
In the meantime, the researchers behind the observatory collaboration have already answered one longstanding question about Jupiter's atmosphere, specifically the Great Red Spot storm that has roiled for centuries. Source: Internet
Measuring 10,000 miles (16,000 kilometres) wide as of April 3, 2017, the Great Red Spot is 1.3 times as wide as Earth and is gradually shrinking over time. Source: Internet