Titlebook: Galactic and Extra-Galactic Radio Astronomy; Gerrit L. Verschuur,Kenneth I. Kellermann Book 19741st edition Springer-Verlag New York Inc.

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https://doi.org/10.1007/978-1-4615-8303-5d their clusters, are used as sources of observational information, but cosmology must also provide the proper frame which enables their formation and evolution. The main emphasis in cosmology is mostly not on the objects. It is on the metric of space and time ; and on the average density of matter,

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