What was Hubble's major contribution to Cosmology?
A) He identified Cepheid Variable stars.
B) He proved the Big Bang Theory.
C) He developed a new method for measuring the absolute magnitude of stars.
D) He identified numerous new galaxies outside the Milky Way.
E) He measured the size of the universe.

Question

Quizplus · Accepted Answer

Hubble's major contribution to cosmology was identifying numerous new galaxies outside the Milky Way, which led to the realization that the universe is far larger than previously thought. He also discovered the relationship between the recessional velocity of galaxies and their distance from Earth, which provided evidence for the expansion of the universe and ultimately led to the development of the Big Bang Theory. However, he did not prove the theory himself.

What Was Hubble's Major Contribution to Cosmology