What system did Hubble and Milton Humason develop to organize galaxies based on visual appearance?
Answer
The Hubble Sequence
Hubble and Humason developed a system, also known as the Hubble Tuning Fork Diagram, to classify galaxies primarily into ellipticals (E), spirals (S/SB), and irregulars (Irr) based on visual morphology.

#Videos
The Man the Hubble Space Telescope was Named After - YouTube
Related Questions
Why was the iconic orbiting observatory named after Edwin Powell Hubble?In what Missouri city was Edwin Hubble born?What undergraduate degree did Hubble earn from the University of Kentucky in 1910?What key instrument at the Mount Wilson Observatory housed Hubble's most significant breakthroughs?What specific stellar feature did Hubble use to determine the distance to the Andromeda Nebula?What phenomenon observed in the light spectra from distant galaxies indicated they were moving away from Earth?What mathematical relationship, formulated by Hubble, described the expansion of the universe?What system did Hubble and Milton Humason develop to organize galaxies based on visual appearance?Which astronomer championed the initial concept for an orbiting observatory decades before the HST's launch?When did the Hubble Space Telescope (HST) officially launch into low Earth orbit?