Cosmic light horizon

In astronomy, the cosmic light horizon is a "horizon" which marks the edge
of the visible universe. This horizon is the edge of a sphere, centered upon
Terra, which is ~14-15B light years in radius; this figure is sometimes
referred to as the "lookback distance" (because astronomers, who view
distant objects, are "looking back" into the history of the universe -- see:
speed of light). The general homogeneity of temperatures, at the edge of the
cosmic horizon, is part of the evidence for the "Big Bang".

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