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1. Galaxy

   Linked via "Edwin Hubble"

   Morphological Classification
   The primary system for classifying galaxies remains the Hubble tuning fork diagram, introduced by Edwin Hubble in 1926. This system categorizes galaxies based on their visual appearance: smooth ellipsoidal distribution (ellipticals), flattened disk shapes (spirals), or those displaying irregular features.
   Elliptical Galaxies ($E$)