How do we get other pictures of far away galaxies that we can not see?
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Imagine that you eat a big burger. Will eating just one make you feel full? Probably yes.
Imagine that you eat popcorn. Will eating just one make you feel full? Probably not. However, if you keep eating more and more and more popcorn, at some point it will end up getting you full.
Replace the food with light and your stomach with a camera. Will opening your aperture for like ½ a second make the camera absorb enough light to get a clear picture of the moon? Probably yes.
Will doing the same with a far away galaxy be enough? Probably not. However, if you expose your camera to the galaxy’s light for a sufficiently long period of time, at some point enough light from it will gather up to give you a clear picture of it.
Edits – spelling and typos
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