As seen on Astronomy Picture of the Day this image was captured from 02:10 to 05:30 PST every 4 minutes at the beach of Kalamalka Lake in British Columbia. The red colouring arises because sunlight reaching the Moon must pass through a long and dense layer of the Earth’s atmosphere, where it is scattered. Shorter wavelengths are more likely to be scattered by the small particles, and so by the time the light has passed through the atmosphere, the longer wavelengths dominate. This resulting light we perceive as red.



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