Jupiter's Great Red Spot Is Twice as Wide as Earth

The Great Red Spot is the best-known feature on Jupiter. NASA describes it as a swirling oval of clouds twice as wide as Earth. Put another way, two planets the size of ours could sit side by side across it. NASA also notes that the spot has been observed on the giant planet for more than 300 years. That long record matters, because it means people have been watching the same feature for centuries, and it is still there. The spot is part of Jupiter’s atmosphere, not a feature on a solid surface, and NASA covers it in the atmosphere section of its Jupiter fact page.