Jupiter's Great Red Spot is a storm that has been raging for at least 400 years, possibly much longer. It's so big that Earth could fit inside it. But here's the thing: it's shrinking!
How Fast Is It Going?
Winds in the Great Red Spot can reach speeds of over 400 miles per hour. It's a massive anticyclone, spinning counterclockwise. Scientists are still trying to understand exactly how it formed and why it's lasted so long.