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_Astronomy版 - Astronomy Picture of Day: Aurora Iowa
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1 (共1页)
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发帖数: 1994
1
Aurora Iowa
Credit & Copyright: Stan Richard
Explanation: Early last Sunday morning stars were not the only lights in
Iowa skies. The northern lights also shone from the heavens, extending
across the midwestern USA and other locations not often graced with auroral
displays. The wide-ranging auroral activity was triggered as a coronal mass
ejection - an energetic cloud of particles blasted outward from the Sun a
few days earlier - collided with planet Earth's magnetosphere. Alerted to
conditions
1 (共1页)
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相关话题的讨论汇总
话题: iowa话题: aurora话题: picture话题: astronomy话题: day