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Astronomy版 - Astronomy Picture of Day: Sunspots and Solar ARs
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发帖数: 1994
1
Sunspots and Solar Active Regions
Explanation: July was a good month for sunspots ... really big sunspots. In fact, the full disk
and inset pictures above show three large groups of spots, photographed only a few days ago on
July 28. Together the sunspots span a region about thirty times the diameter of planet Earth.
Now rotating behind the Sun's visible edge, these groups followed close on the heels of another
enormous sunspot group which appeared in mid July. All of July's monster sunspot grou
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