Ask Ethan: How Large Is The Entire, Unobservable Universe?
If we know how big the observable Universe is, why can’t we figure out how big the unobservable part is?
13.8 billion years ago, the Big Bang occurred. The Universe was filled with matter, antimatter, radiation, and existed in an ultra-hot, ultra-dense, but expanding-and-cooling state. By today, the volume containing our observable Universe has expanded to be 46 billion light years in radius, with the light that’s first arriving at our eyes today corresponding to the limit of what we can measure. But what lies beyond? What about the unobservable Universe? That’s what Gray Bryan wants to know, as he asks:/.../
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