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International Year of Astronomy - IYA2009
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Why is it dark at night?
Just like being in a large forest, where in every direction and in our entire field of vision we can see trees that are either somewhat closer or further away, in a Universe that is infinite and filled evenly with stars or galaxies, we would have to see a star in every direction, sooner or later. The night sky should actually gleam as brightly as the surface of the Sun. But why doesn't this happen?
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Last update: 04/02/2010 16:24:59