By studying distant galaxies in the 1920s,Hubble made which of the following important discoveries that led us to conclude that the universe is expanding?
A)All galaxies contain billions of stars,and all galaxies have spiral shapes.
B)All galaxies were born at the same time,and all will die at the same time.
C)All galaxies outside the Local Group are moving away from us,and the farther away they are,the faster they're going.
D)All galaxies outside the Local Group are orbiting the Local Group.
E)All galaxies outside the Local Group are moving away from us,and all are moving away at nearly the same speed.

Question

Quizplus · Accepted Answer

By observing the spectral lines of light from distant galaxies, Hubble discovered that they all exhibited redshift, indicating that they were moving away from us. He also found that the farther away a galaxy was, the faster it was moving away. This led to the conclusion that the universe is expanding.

By Studying Distant Galaxies in the 1920s,Hubble Made Which of the Following