Cosmologists who study the structure and evolution of the universe have developed a number of theories to explain the its origins. One of the most popular was called the steady-state theory. The theory was first proposed by Thomas Gold and Hermann Bondi (1919-) in 1948. They suggested that the structure of the universe is homogeneous; it is the same everywhere, no matter in what part of the universe you are located. They called this assumption the cosmological principle. They went on to suggest that the universe was not only the same from everywhere, but also from "every-when." The cosmological principal is consistent; the universe should look the same not only from all locations, but at all times, past, present and future.

Edwin Powell Hubble had found that the universe was expanding, and the galaxies were all moving away from each other. To account for such observations, it...