Abstract: Cosmology is a part of the natural sciences which has remained in the philosophical realm for a very long time. Only comparatively recently have observations taken part in shaping our picture of the universe. The modern belief of a “hot big bang” cosmology is based on a few fundamental results: i) the discovery that the nebulae are systems external to our own galaxy (Hubble 1926) together with the realization that our galaxy is a common type of spiral system in a rather homogeneous distribution of galaxies made it very un likely that we occupy a preferred position in the universe. ii) In 1929 Hubble found evidence that the distant galaxies are receding from us with a velocity proportional to their distance. This linear relation between recession velocity and distance — appropriately named “Hubble’s Law” — must be considered as one of the outstanding discoveries of modern physics. We shall discuss its present observational status in detail (sec. 3). If evervthing is flying apart now, it must have been closer together earlier, and therefore it seems quite natural to deduce that the universe was denser in the past.
Publication Year: 1993
Publication Date: 1993-01-01
Language: en
Type: article
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Cited By Count: 14
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