Hubble's galaxy classification diagram (the "tuning fork")
A)explains active galactic nuclei.
B)shows how galaxies evolve from one form to another.
C)suggests the existence of black holes.
D)relates galaxies according to their shapes,but not according to any evolutionary status.

Question

Quizplus · Accepted Answer

Hubble's tuning fork diagram classifies galaxies based on their shapes (ellipticals, spirals, and barred spirals) without implying any evolutionary relationship between these different types.

Hubble's Galaxy Classification Diagram (The "Tuning Fork")