The full moon falls into total eclipse, becoming what is popularly referred to as a blood moon on January 20, 2019. Lunar eclipses occur when the Earth passes between the sun and the moon, blocking direct sunlight from reaching the moon's surface. A small amount of red-orange light, however, bends around the Earth and passes through its atmosphere, a phenomenon known as Rayleigh scattering, causing the moon to glow red during the totality phase of the eclipse.
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