Ruijinzhang8379 Ruijinzhang8379

12-12-2022
Physics

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how do we define the horizon of the observable universe? it is the point past which there are no more galaxies, just empty space. it defines the half of the sky which we cannot see because of our position on the earth. it is a point in space exactly 14 billion light-years away in every direction. it is the limit which represents looking back to the beginning of the universe.

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