Red and low on the horizon, blue, black or pink: the Moon seems to change its dress from night to night. Yet our satellite is gray, in a thousand shades of gray.
What lies behind these colors and names? And what do they say about the energy of the moment? Here is the guide to colored moons.
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Why does the Moon change color?
With no atmosphere, water or vegetation, the Moon is gray: it simply reflects the light of the Sun. The colors we see in it are born in our own atmosphere.
When it rises or sets, its light crosses a thicker layer of air, which scatters blue and lets orange and red through: hence the big orange moon just above the horizon. In autumn, the full moon closest to the equinox, the Harvest Moon, rises at dusk several evenings in a row and often takes on these golden hues.
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