How do we know that there's a real color of space, that isn't in our light spectrum.?
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Black is the absence of all EM radiation, by definition.
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When all the light in the universe is averaged out, the color of space is a light beige. No joke..! See this website =>http://apod.nasa.gov/apod/ap091101.htm…
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Actually, it's colourless. We perceive it as "black" because of the absence of light (or more precisely, because we don't see light reflecting off it).
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Because space is an endless void and vacuum meaning the lack of color and light throughout it's reachs there for it is presumed as black scientifically and because we c black when we look lol
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Because your eyes tell you it is. Bam