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发帖数: 1994 | 1 Aurora Over Alaska
Credit: Joshua Strang, USAF, Wikipedia
Explanation: Higher than the highest mountain, higher than the highest
airplane, lies the realm of the aurora. Aurora rarely reach below 60
kilometers, and can range up to 1000 kilometers. Aurora light results from
solar shockwave causing energetic electrons and protons to striking
molecules in the Earth's atmosphere. Frequently, when viewed from space, a
complete aurora will appear as a circle around one of the Earth's magnetic
poles. Th |
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