olbers's paradox

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Paradox of why the sky is dark at night. If the universe is endless and uniformly populated with luminous stars, every line of sight must end at the surface of a star and the night sky should be bright with no dark spaces between stars. This paradox is widely attributed to Heinrich Wilhelm Olbers (1758-1840), who discussed it in 1823, though Johannes Kepler first advanced the problem in 1610 as an argument against the notion of a limitless universe with infinite stars. The paradox has since been resolved: we can see no farther than the light-travel distance within the lifetime of the universe, and light becomes redshifted to invisibility (see redshift)

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Olbers' paradox
the observation that the night sky is mostly dark, yet, in a boundless universe of stars, every line of sight from the eye must eventually intercept the surface of a star
olbers's paradox
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