What did Edwin Hubble study in the Andromeda Galaxy that proved it was an individual galaxy and not part of our own Milky Way?
A) Cepheid stars
B) Type Ia supernovae
C) globular clusters
D) red giant stars

Question

Quizplus · Accepted Answer

Edwin Hubble studied Cepheid stars in the Andromeda Galaxy and found that they had a much greater distance than any stars previously observed. This led him to conclude that the Andromeda Galaxy was a separate galaxy from our own Milky Way.

What Did Edwin Hubble Study in the Andromeda Galaxy That