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Tue 9 Feb, 2021 06:58 am
How to apply the red-shifting-of-light explanation of the darkness of the sky to the space between the Earth and the Moon: we see this area dark though the Sun's light travels through it?
@bearnard45,
You don't need red shifting to explain this. You perceive something as bright when it reflects or transmits visible light towards your eyes. In space there is nothing to reflect light towards your eyes (unlike the atmosphere where there is air, dust, etc) so sunlight passes through without interacting.