Why is the moon red during a lunar eclipse- that is, when the moon is in the earth's shadow?

Question

please add source of answer

Answer 1

If you were standing on the Moon during the eclipse, you would see the Earth covering the Sun, but you would also see a lot of light refracted through the Earth's atmosphere, "around the edge" of the Earth. This light is mostly red for the same reason sunsets are red: when light passes through that much air, most of the blue light is scattered out, leaving only the red light remaining.

That remaining red light, during a lunar eclipse, turns the Moon red.

Answer 2

Because light with a short wavelength (the blue side of the spectrum) is scattered by particles in the atmosphere and light with a long wavelength (the red side of the spectrum) is not.
This happens also when there is no eclipse (that's why the moon is yellowish normally instead of white) but with the dim light that comes from the moon during an eclipse this effect is more visible.

Answer 3

I think there is "wrap-around" light that scatters off the earth as "earthshine".

Answer 4

refraction ....