The astronomer who originally classified galaxies into S, E, and Irr was
A) William Herschel.
B) Edwin Hubble.
C) Henrietta Leavitt.
D) Harlow Shapley.
E) Carl Sagan.

Question

Quizplus · Accepted Answer

Edwin Hubble is credited with creating the classification system for galaxies, known as the Hubble sequence, which includes the categories of spiral (S), elliptical (E), and irregular (Irr) galaxies.

The Astronomer Who Originally Classified Galaxies into S, E, and Irr