by A. C. B. Lovell, O.B.E., F.R.S., Professor of Radio Astronomy in the University of Manchester and Director of the Jodrell Bank Experimental Station.

Evolutionary theories of the origin of the universe, like that of Abbe Lemaitre, command a wide measure of support among contemporary astronomers. But they represent only one group of theories. An alternative is found in the steady slate theories. According to these the universe has always been as it is today and always will be. Throughout infinite space creation is going on continuously: now and always the primeval gas is being created from which the galaxies have evolved and are still evolving.
It is probably true to say that the main issue in present day cosmology is the conflict between the evolutionary and steady state theories. The difference between them is clearly fundamental and of the greatest importance to both science and philosophy.

These lectures will be printed in 'The Listener'