Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977amsci..65..188l&link_type=abstract
American Scientist, vol. 65, Mar.-Apr. 1977, p. 188-196.
Astronomy and Astrophysics
Astrophysics
8
Cosmology, Galactic Evolution, Stellar Evolution, Astrophysics, Density Wave Model, Elliptical Galaxies, Gravitational Collapse, Interacting Galaxies, Quasars, Seyfert Galaxies, Spiral Galaxies, Supernovae
Scientific paper
The article surveys recent theory on the evolution of galaxies, interpretations of apparent interacting galaxies, expansion and collapse of protogalaxies or locally gravitationally bound regions of the universe, origins of types of galaxies, and searches for young galaxies. Formation of stars from gas, expulsion of gas from galaxies (by supernova explosions and shocks), infall of gas into galaxies, intergalactic gas, tidal distortion or collisions between galaxies, density waves, and relation between gas content and galaxy flatness are explored. Theory relating quasars to Seyfert spirals, ellipticals, or young galaxies is considered.
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