Aurora in Canada

張貼者：
Aurora is beautiful and magical thing.
I wish I could keep them in one bottle so that I can watch them all the time.

極光是太陽風裡的高能粒子高速撞擊大氣層高空中的氣體原子，像是氫、氧這些原子。撞擊後會激發他們的電子躍升到較高的電子軌道，當電子又落回原先的軌道時就會發出光芒。
高中物理，我還記得 :)

詳細解釋和圖片來自這裡

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