Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002eaa..booke4707.&link_type=abstract
"Encyclopedia of Astronomy and Astrophysics, Edited by Paul Murdin, article 4707. Bristol: Institute of Physics Publishing, 2001
Astronomy and Astrophysics
Astrophysics
Galaxies, Galactic Models And Concepts
Scientific paper
A galaxy in which a central bulge of stars is surrounded by a flattened disk that contains a spiral pattern of hot young stars and luminous nebulae. Within the Hubble classification scheme, spiral galaxies, denoted by the letter `S', are categorized according to the size of the central bulge, the tightness of the spiral pattern and the degree of patchiness in the spiral arms. Sa galaxies have rel...
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