2016年12月21日 星期三

Winter Solstice: A look at the solar system's north poles

Today is the solstice, the longest winter night at Earth's north pole, the longest day of summer in the south. To give a little light to northerners in darkness today, please enjoy this gallery of images of (mostly) sunlit north poles across our solar system.

from Planetary Society Blog http://ift.tt/2h9xSKs
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