Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978sciam.239..110g&link_type=abstract
Scientific American, vol. 239, Nov. 1978, p. 110-112, 116, 117 (7 ff.).
Astronomy and Astrophysics
Astronomy
Galactic Clusters, Gravitational Effects, Gravitational Fields, Astronomical Maps, Elliptical Galaxies, Galactic Structure, Hydrogen Clouds, Intergalactic Media, Mass Distribution, Radio Galaxies, X Ray Astronomy
Scientific paper
Over the past half century large telescopes have revealed thousands of richly populated clusters, each of which consists of thousands of galaxies made up of tens of billions of stars. In comparison the Galaxy is a member of a very small system known as the local group, consisting of no more than two dozen galaxies, most of them much smaller than the Galaxy itself. Studies of several rich clusters have shown that most of the thousands of galaxies in them are swarming through space at thousands of kilometers per second. The high velocity of these galaxies and their dense distribution in space imply that they are bound together by gravitational forces much greater than those that can be accounted for by the visible mass, that is by the mass represented by the objects visible on photographic plates. Quite recent observations have led to the extraordinary suggestion that the giant galaxy M87, located near the center of the large cluster in the constellation Virgo, may have in its nucleus a black hole with a mass equal to that of five billion suns.
Gorenstein Paul
Tucker Warwick
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