The Moon will turn an eerie shade of red for people in the western hemisphere late Wednesday and early Thursday, recreating the eclipse that saved Christopher Columbus more than five centuries ago. In a lunar eclipse, the Sun, Earth and Moon are directly aligned and the Moon swings into the cone of shadow cast by the Earth. But the Moon does not become invisible, as there is still residual light that is deflected towards it by our atmosphere. Most of this refracted light is in the red part of the spectrum and as a result the Moon, seen from Earth,...
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