The reason its called the observable universe is cause everything outside of it is moving fast enough away from us that it is physically impossible to ever get any light from outside of it. Everything that passes this point is gone from us forever. Relevant kurzgesagt about 4 minutes in
The reason its called the observable universe is cause everything outside of it is moving fast enough away from us that it is physically impossible to ever get any light from outside of it. Everything that passes this point is gone from us forever. Relevant kurzgesagt about 4 minutes in