Aurora Borealis or Northern Lights. Curtain aurora observed from Greenland, 6 January 1861. Caused by high-speed particles ejected from the Sun, they are most commonly observed during periods of maximum sunspots. From "Die Naturkrafte" by M Wilhelm Meyer (Leipzig, 1903). Chromolithograph. (Photo by: Universal History Archive/UIG via Getty Images)
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Album / Universal Images Group / Universal History Images \ UIG