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All of space time is expanding, objects within space are all affected by this. However the "pressure" of the expansion at small scales is nowhere near the forces holding things together. Go back to the idea of a balloon being blow up to explain space-time expanding. Now if you put those sticky paper dots about 1cm across on it to represent the galaxies. Now what you see is the distance between each galaxy increasing , but the galaxy it’s self is not getting bigger.
So we are not all flying apart, but on the biggest scales this expansion becomes evident. the really weird thing is it seems to be speeding up!!
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