Thank-you for your reply. You may be right, but I think that there may be some confusion here. Edwin Hubble (1889-1953) measured the radial velocities of the galaxies and discovered that almost all of them were receding from the Milky Way, and that their radial velocities were directly proportional to their distances. Before Hubble's time, astronomers thought that the universe was static; indeed, most astronomers thought that the 'extragalactic nebulae' were part of our own Galaxy rather than being independent 'island universes'. Edwin Hubble's observations disproved this 'static universe' model and showed that the 'extragalactic nebulae' were star systems of the same type as the Milky Way.
However, the pre-Hubble 'static universe' model was not the same as Hoyle's 'steady-state' or 'continuous creation' model. Hoyle accepted that the universe was expanding and therefore that the density of matter ought to decrease, but he thought that new matter was continuously being created in the form of hydrogen atoms to maintain a constant density. This newly created hydrogen condensed into new galaxies and stars, with the result that the universe was eternal and looked much the same at all times. Hoyle called this 'the perfect cosmological principle'.