Physics
Scientific paper
Apr 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pht....40d..28s&link_type=abstract
Physics Today (ISSN 0031-9228), vol. 40, April 1987, p. 28-35.
Physics
Astronomical Models, Cosmology, Galactic Evolution, Galactic Structure, Dark Matter, Galactic Clusters, Gravitational Effects, Star Formation, String Theory
Scientific paper
Current hypotheses on how galaxies originated and acquired their observed forms, and the relation of galaxies to the universe are discussed. A galaxy is a star pile, with the stars orbiting in their mutual gravitational potential well, and the average luminosity of a galaxy is about 4 x 10 to the 10th solar luminosities. The formation of galaxies is examined in terms of the rate and efficiency of star formation. The relation between density and temperature fluctations in the universe is analyzed in order to understand the distribution and properties of galaxies. The effects of dark matter on galaxy formation are investigated. The shapes and sizes of galaxies are described; the dependence of the galactic binding energy distribution on galactic morphology is studied.
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