Light pollution.

Go on to youtube and type in "light pollution".

I remember as a kid going to visit friends in arizona, who used to live next to us, back about 1981. At night you saw more stars than you saw space. Hence the name milky way.

I went back in 1996, and the build up in population and construction compared to 15 years earlier was pretty massive. The second time around the stars in the sky were vastly decreased......about 50% conservatively. It was very apparent the increase in lights was the reason for the decrease in stars.

Alot of people do not give this type of pollution much thought, but they should.

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