Since bottoming out in 2009 as part of an 11-year cycle, activity on the sun has been heading for a peak.
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The side-by-side photos from NASA's Solar Dynamics Observatory show just what a difference a couple of years can make.
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This is a screenshot, so please find out and watch the related videos, which run simultaneously in the same frame.
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The photo on the left is from October, 2010, when activity was very low; the one on the right is from just last month.
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Both are seen in extreme ultraviolet light, and both show solar activity for one month.
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第六十六篇: 太阳活动的巅峰
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