Answer :

Final answer:

During a total lunar eclipse, the moon appears coppery red due to Raleigh scattering. This physical effect, which also causes the sky to appear blue, causes red and orange wavelengths to predominate when sunlight passes through Earth's atmosphere and hits the moon's surface.

Explanation:

During a total lunar eclipse, the moon may appear as a coppery red color. This is due to an effect known as Raleigh scattering. This is the same physical effect that causes the sky to appear blue during the day. Light from the sun is seen from the Earth's surface as blue most of the time because of the scattering of sunlight by the Earth's atmosphere.

When there is a total lunar eclipse, the Earth is between the sun and the moon, so sunlight has to pass through the Earth's atmosphere. This causes the sunlight to be scattered, with red and orange wavelengths being scattered the least and thus predominating when they reach and are reflected off the moon's surface. This results in our seeing the moon as coppery red during a total lunar eclipse.

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