Volume 18, Issue 3, 1970
Włodzimierz Zonn
Pages 5-11
Observational Aspects of Modern Cosmology
The writer presents some results of extragalactic observations which play or allegedly would play rather important role in cosmology, discussing each of them shortly. First the redshift impying the finite age of the universe; later the isotropy and the general clustering tendency of the population of our neighborhood, and finally the fact, that all galaxies appear in some discrete morfological types, suggesting that their evolution follow different ways depending probably upon the initial mass or age of a given galaxy.
Finally two groups of the modern cosmological theories are outlined — the evolutional theories and those of steady state — and the chief ideas concerning their observational testing are presented.