Because space is huge and satellites are tiny. It's like why you can't see a football on the ground from a commercial airliner
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They are way to small, space is BIG.
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the pics don't have enough pixels to see them at this distance. they are small fractions of the pixels.
They're tiny relative to space. They don't produce any light so on non-backlit shots, you wouldn't see them unless the sun reflected off a surface the right way.
This guy explains it perfectly Dave McKeegan
If you get some place you can see the starry sky, sometimes you can pick out satellites. It might look like a small bright star moving across the sky in a straight line.
Sometimes they're just aircraft. I'm not really up on my astronomy, so I'm sure some of them could be other celestial bodies. But I'm pretty sure a satellite appears to move faster than a planet and slower than a shooting star
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