What boundary is defined by the maximum distance light could travel in 13.8 billion years?
Answer
The cosmic horizon
The finite age of the universe sets a physical limit on what we can observe. If we imagine a sphere centered on Earth, its radius corresponds to the maximum distance that light could have traversed since the beginning of the universe, roughly 13.8 billion years ago. This sphere delineates the limit of our current observational capabilities, and the boundary itself is termed the cosmic horizon. Light originating from anything outside this defined sphere is still currently on its journey toward us.
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