How do streetlights make it harder for us to see the stars in the night sky?
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Because the light reflects on everything (the ground, the walls of the houses, the cars, etc…), and that light is reflected by the air and the dust/water particles that fly around. Even when you’re miles away from the closest lamppost, you can tell a city is behind a hill because air above the horizon will have that white/yellow halo, even though you don’t see the lights or any building in that city. You only see air.
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