Question: When was the English astronomer many years before which Albert Einstein once attempted a steady-state model of the expanding universe born? 
Sentence (from "Physical cosmology"): Physical cosmology, as it is now understood, began with the development in 1915 of Albert Einstein's general theory of relativity, followed by major observational discoveries in the 1920s: first, Edwin Hubble discovered that the universe contains a huge number of external galaxies beyond our own Milky Way; then, work by Vesto Slipher and others showed that the universe is expanding.
Relevant evidence: No