Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985rspsa.400..183r&link_type=abstract
Royal Society (London), Proceedings, Series A - Mathematical and Physical Sciences (ISSN 0080-4630), vol. 400, no. 1819, Aug. 8,
Astronomy and Astrophysics
Astronomy
3
Cosmology, Galactic Evolution, Galactic Nuclei, Galactic Structure, Black Holes (Astronomy), Cygnus Constellation, Flow Charts, Gravitational Collapse, Quasars, Stellar Models
Scientific paper
Although much is known about stars and stellar evolution, the most basic questions about galaxies are still unresolved. The considered lecture is concerned with an assessment of such questions. It is pointed out that it is not known why such things as galaxies should exist at all. Approximately 90 percent of the mass associated with galaxies is 'hidden', and the luminous stars and gas contribute only about a tenth of the gravitating material inferred from dynamical arguments. The nature of the 'hidden' mass remains still a mystery. Another question is related to the reasons for the flare-up of some galactic nuclei and the release of the colossal amount of nonstellar radiation emitted from quasars and radio galaxies. The present state of knowledge regarding these questions is evaluated.
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