According to Amy Simon of NASA's Goddard Space Flight Center in Greenbelt, Maryland, recent NASA Hubble Space Telescope observations confirm the Great Red Spot now is approximately 10,250 miles across, less than half the size of some historical measurements. Astronomers have followed this downsizing since the 1930s.
Images of Jupiter's Great Red Spot taken by the Hubble Space Telescope over a span of 20 years show that the Great Red Spot is shrinking.
Beginning in 2012, amateur observations revealed a noticeable increase in the rate at which the spot is shrinking -- by 580 miles per year -- changing its shape from an oval to a circle.
More - Link >>> http://science.nasa.gov/science-news/science-at-nasa/2014/15may_grs/
Source: NASA Science News.
2014: 75th Year of Pittsburgh's Buhl Planetarium
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