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An X5 solar flare, the strongest observed in 2012, seen through an ultraviolet filter by NASA's Solar Dynamics Observatory March 7, 2012. (NASA)
25 Photos from Out of This World |
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May 24, 2013
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May 24, 2013
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May 24, 2013
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May 23, 2013
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May 23, 2013
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