ELi5: Is the entire Universe (unobservable + observable) 13.8 billion years old or just the observable Universe 13.8 billion years old?
In: Physics
The universe is believed to be 13.8b y.o. observable and unobservabke.
The reason that there is universe beyond 13.8 light years away is that, it is believed The universe itself is expanding faster than the speed of light.
The stuff we cannot see is still only 13.8b y.o. it’s just expanding away from us very, very quickly.
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