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[–] clamhurt_legbeard ago 

I see how you're misunderstanding this! :)

The light from the stars DOES enter the camera, but if the sun is reflecting off an astronaut in the picture, he reflects WAY WAY WAY more photons, since hrs so much closer to the camera. The light bouncing off him overwhelms your eyes or the camera, so you lose the faint, dim stars in the background.

No atmosphere was needed at all.

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[–] SaveTheChildren [S] 1 point -1 points (+0|-1) ago 

That doesn't make any sense.

There's no atmosphere for the light from any other object to interfere unless it blocks the starlight.

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[–] clamhurt_legbeard ago 

Exactly, the atmosphere has nothing to do with it (there's no atmosphere in space).

It's all about difference in brightness.