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Large Sunspot Cluster Today, Eight Times the Diameter of the Earth
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Look at the large sunspot cluster—it's Sunspot 1429, near the top of the photo. If you measure it, you can see that its length is about 8 times the diameter of the Earth!
Added March 8, 2012: This large sunspot is the one that has erupted into the solar flares that have been in the news the last couple of days. Click here for a photo taken two days later, on March 8, 2012.
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