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Olbers' paradox states that given the Universe is unbounded,
governed by the standard laws of physics, and populated by light
sources, the night sky should be ablaze with light. Obviously this
is not so. However, the paradox does not lie in nature but in our
understanding of physics. A Universe with a finite age, such as
follows from big-bang theory, necessarily has galaxies of finite
age. This means we can only see some of the galaxies in the
Universe, which is the main reason why the night sky is dark. Just
how dark can be calculated using the astrophysics of galaxies and
stars and the dynamics of relativistic cosmology.
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