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.

What system did Hubble and Milton Humason develop to organize galaxies based on visual appearance?

#Videos

The Man the Hubble Space Telescope was Named After - YouTube

telescopeAstronomerinstrumenteponym