Light/Dark Universe

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 preoccupies astrophysicists at the present. The answer to both questions tells us about the origin of the universe and the nature of its contents luminous galaxies like the Milky Way, plus...
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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 preoccupies astrophysicists at the present. The answer to both questions tells us about the origin of the universe and the nature of its contents luminous galaxies like the Milky Way, plus the dark matter between them and the mysterious dark energy which appears to be pushing everything apart. In this book, the fascinating history of Olbers' Paradox is reviewed, and the intricate physics of the light/dark universe is examined in detail. The fact that the night sky is dark (a basic astronomical observation that anybody can make) turns out to be connected with the finite age of the universe, thereby confirming some event like the Big Bang. But the space between the galaxies is not perfectly black, and data on its murkiness at various wavelengths can be used to constrain and identify its unseen constituents.Contents: The Enigma of the Dark Night SkyThe Intensity of Cosmic Background LightThe Spectrum of Cosmic Background LightDark CosmologyThe Radio and Microwave BackgroundsThe Infrared and Visible BackgroundsThe Ultraviolet BackgroundThe X-Ray and Gamma-Ray BackgroundsThe High-Energy Gamma-Ray BackgroundThe Universe Seen Darkly
Readership: Informed readers interested in astronomy.
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