Edwin Hubble was awarded the 1939 Franklin Medal in Physics for "his extensive study of the nebulae, particularly those outside our galaxy, as a result of which the dimensions of observed space have been greatly increased."
Other awards and honors bestowed on Hubble include:
In the latter part of his career, Hubble campaigned heartily for astronomy to be considered an area of physics rather than its own discipline. This was primarily so that he and fellow astronomers could be recognized by the Nobel Prize Committee for contributions to astrophysics. Even though Hubble was unsucessful for many years, the Committee eventually decided that work in the field of astronomy could be eligible for the Nobel Prize in physics. However, the decision came too late for Hubble; it was made a few months after his death in 1953. The Nobel Prize has never been awarded posthumously.
CSA Sub-Committee Report, Report of the standing sub-Committee on the Franklin Medal (and unbound copy), 12/14/1938 (744k)
CSA Report, Report on the work of Dr. Edwin Hubble, 1/11/1939 (662k)