What Is The Universe?
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"The Universe," informally, means "everything there is" - mountains and oceans and the moonand hot nuclear balls of hydrogen and a whole lot more.But if the Universe is "everything", does that mean it includes the things that we don'tknow that we don't know exist? Or even the things that we believe exist but haven't yetseen or observed? For example, is the future a part of the universe?In physics, we usually distinguish between these two notions of universe as 1) the "observableuniverse," which is everything whose existence we've thus far been able to confirm or observe,and 2) "The Universe" with a capital U, or, "The Whole Universe," ...
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"The Universe," informally, means "everything there is" - mountains and oceans and the moonand hot nuclear balls of hydrogen and a whole lot more.But if the Universe is "everything", does that mean it includes the things that we don'tknow that we don't know exist? Or even the things that we believe exist but haven't yetseen or observed? For example, is the future a part of the universe?In physics, we usually distinguish between these two notions of universe as 1) the "observableuniverse," which is everything whose existence we've thus far been able to confirm or observe,and 2) "The Universe" with a capital U, or, "The Whole Universe," ...
