glieseg t1_ix75gzd wrote
Reply to comment by IronSmithFE in Someone tell me how the Big Bang began 13 billion years ago, yet the *observable* universe is 83 billion light years apart? by novacks0001
Imagine you have a balloon. Paint some dots on it and blow some air in it. All the dots move away from each other because the balloon (the universe) is expanding, despite the dots not moving physically on the balloon.
The surface of the balloon itself is curved 2 dimensions, but the analogy works for the universe, too.
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