...of the various Hubble classes of galaxies....
...theories and the Hubble classification system for...
...to 42. Edwin Hubble is one of...
...the twentieth century: www.time.com/time/time100/scientist/profile/hubble.html . Hubble was...
...century: www.time.com/time/time100/scientist/profile/hubble.html . Hubble was also on...
...site devoted to Hubble’s life and work...
...Goldsmith, D. “Edwin Hubble and the Universe...
...Legacy of Edwin Hubble” in Astronomy, Dec....
...al. “Young Edwin Hubble” in Mercury, Jan./Feb....
...R. Brashear. “Edwin Hubble and the Expanding...
...from Wright to Hubble” in Sky &...
...biography of E. Hubble. Seeley, D., and...
...G. “Understanding the Hubble Sequence ” in...
...of Sand: The Hubble Deep Field” in...
...from Wright to Hubble” in Sky &...
...Golden Anniversary of Hubble’s Classification System” in...