There's also the issue of the inverse-square-law. Most of the images we create don't match we'd see if we were there. Actually, what does "there" even mean? No software, as far I can tell, reverses the inverse square law to create an image based on brightness (and therefore colour) that would be true to a given distance from the object.
Plus just adding more exposure time means you're bringing out fainter details and colours in an object that we might not see at all with our eyes because integration boosts them.
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