How long has Jupiter's Great Red Spot been continuously observed?
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The Great Red Spot is a colossal storm, larger than Earth, that has been observed for centuries. Its exact age is debated, but sustained observations date back to at least 1665, making it one of the longest-lasting natural phenomena known. Despite its incredible longevity, the storm has been shrinking in recent decades. Photo: Kevin Gill from Los Angeles, CA, United States, Wikimedia Commons, CC BY 2.0.
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Source: Wikipedia (CC BY-SA)
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