The boundary of everything humans can observe stretches roughly 92 billion light-years across, a figure shaped by 13.8 billion years of cosmic expansion since the Big Bang. That number, derived from ...
The universe’s expansion makes cosmic distance far less intuitive than simply measuring how long light has traveled.
The portion of the cosmos from which light has had time to reach Earth spans roughly 92 to 93 billion light-years in diameter, a figure that dwarfs the 13.8-billion-year age of the universe and ...
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