Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000eaa..booke4698.&link_type=abstract
"Encyclopedia of Astronomy and Astrophysics, Edited by Paul Murdin, article 4698. Bristol: Institute of Physics Publishing, 2001
Astronomy and Astrophysics
Astrophysics
Galaxies, Galactic Models And Concepts
Scientific paper
A galaxy with an irregular appearance and no well-defined shape or structure. Irregular galaxies can be divided into two broad classes, designated Irr I and Irr II. Irr I galaxies contain many OB associations (clumps of hot, young, highly luminous stars) and HII regions (luminous clouds of ionized hydrogen that surround hot young stars) and significant quantities of gas (typically about 20% of th...
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