As you can see, the visible portion makes up an incredibly small fraction of the total electromagnetic spectrum. Less than 1% of all light that reaches us is in the visible spectrum. By most estimates it comes out to about .0035% of the entire electromagnetic spectrum.
So because the human eye is incredibly limited in its range, we see only that one tiny fraction of the electromagnetic spectrum. We see amazingly well within that tiny band, but beyond that nothing. If we could see in all wavelengths, the night sky would be almost as bright as the daytime sky. Almost because the daytime would be .0035% brighter.
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