Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002eaa..booke4706.&link_type=abstract
"Encyclopedia of Astronomy and Astrophysics, Edited by Paul Murdin, article 4706. Bristol: Institute of Physics Publishing, 2001
Astronomy and Astrophysics
Astrophysics
Galaxies, Galactic Models And Concepts
Scientific paper
Lanes of gas, dust and hot young stars that spiral outwards from the central bulges of spiral and barred spiral galaxies. The most prominent features of spiral arms are clusters and associations of O and B type stars (highly luminous, high-temperature stars) and HII regions (luminous nebulae), both of which are indicative of recent and ongoing star formation. At radio wavelengths, spiral arms may...
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