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Question 3:
Why do you think the Great Red Spot is shrinking?

Students' answers will vary. Astronomers have been tracking Jupiter's Great Red Spot since the late 1800s. At that time, the storm was so large that three Earths could squeeze inside it. Today, just one Earth can fit inside the storm. The red spot's shape also has changed, becoming more circular. In the past, the storm had an oval shape. Astronomers believe that some unknown activity deep inside the planet's atmosphere may be responsible for the storm's change in size. Students may suggest that perhaps the planet is undergoing a climate change, just as Earth appears to be.

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