What Lies Beyond The Observable Universe?
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13.8 billion years ago, the Big bang occured. Our universe came into existence. The universe was filled with matter, radiation, antimatter and existed in a hot, dense, expanding state. Even though it’s been billions of years since the Big Bang there is a cosmic limit to how far we can see.
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The universe has been expanding all this time, but that expansion rate is both finite and well-measured by us. If we were to calculate how far a photon emitted from the Big Bang could have travelled by today, we come up with an upper limit to how far we can see in one direction: 46 Billion light years. That is what we call our observable universe. But what lies beyond the observable universe? What about the unobservable universe?
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