![]() Light pollution affects primarily the observations of faint objects, such as nebulae or distant galaxies. Long exposure pictures in cities will reveal the orange skyglow, which is the main reason why you can't see the stars - it's like noise masking off the faint light from the distant objects: ![]() The dome of light above the city is very visible if imaged from afar: ![]() Here's a somewhat better (but not perfect) comparison of a dark sky versus light polluted sky (your picture was taken with a very long exposure that doesn't look very realistic): The white zones are the worst, and they are in the middle of the cities. This is the one factor, above everything else, that affects your ability to see the stars. The core problem here, by a very wide margin, is light pollution if you live in a large city. That's just so much hand waving, given that the first thing you said was "I've always lived in somewhat large cities". I see other replies mentioning weather conditions, dark adaptation and so on. This is a simple and clear issue, with a unique answer.
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