Who first proposed that the observed motion of galaxies away from Earth originated as an expansion outward from an extremely dense state of matter at the beginning of the universe?
A) Edwin Hubble
B) George Gamow
C) Fred Hoyle
D) Georges Lemaître

Question

Quizplus · Accepted Answer

Georges Lemaître, a Belgian priest, astronomer, and professor of physics, was the first to propose the theory of the expansion of the universe, which he described as the "hypothesis of the primeval atom" or the "Big Bang theory," in the 1920s. This was before Edwin Hubble made his observations that galaxies are moving away from each other, which provided evidence supporting Lemaître's theory.

Who First Proposed That the Observed Motion of Galaxies Away