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Books > Science & Mathematics > Astronomy, space & time > Galaxies, clusters, intergalactic matter
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Dark Sky, Dark Matter (Hardcover)
Loot Price: R7,778
Discovery Miles 77 780
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Dark Sky, Dark Matter (Hardcover)
Series: Series in Astronomy and Astrophysics
Expected to ship within 12 - 19 working days
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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.
We know from the dynamics of individual galaxies and clusters of
galaxies that the majority of matter that exerts gravitational
forces is not detectable by conventional telescopes. This dark
matter could have many forms, and candidates include various types
of elementary particles as well as vacuum fluctuations, black
holes, and others. Most of these candidates are unstable to decay
and produce photons. So dark matter does not only affect the
dynamics of the Universe, but the intensity of intergalactic
radiation as well. Conversely, we can use observations of
background radiation to constrain the nature and density of dark
matter.
By comparing observational data with cosmological theory based on
general relativity and particle physics, Dark Sky, Dark Matter
reviews our present understanding of the universe and the
astrophysics of the night sky and dark matter.
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