The vastness of the universe in time and space is incomprehensible.
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It’s actually quite comprehensible. The matter in our Universe is finite and there are reasonable estimates for the number of protons and even photons.
“The vastness of the universe...”? It IS infinite space or it exists within infinite space. Even if expanding,what lies past it’s expanding edges? Expanding into what? Infinite space... always has been and always will be, whether partially filled or empty. It is well to ask, what do we know that lasts forever. BeGood