The light/dark universe : light from galaxies, dark matter and dark energy / James M. Overduin, Paul S. Wesson.
To the eyes of the average person and the trained scientist, the night sky is dark, even though the universe is populated by myriads of bright galaxies. Why this happens is a question commonly called Olbers' Paradox, and dates from at least 1823. How dark is the night sky is a question which pr...
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