What two quantities did Edwin Hubble compare for a sample of galaxies to discover the expansion of the universe?
A)velocity and temperature
B)luminosity and distance
C)velocity and distance
D)age and distance
E)luminosity and temperature

Question

Quizplus · Accepted Answer

Edwin Hubble compared the velocities and distances of galaxies to discover the expansion of the universe. He found that the farther away a galaxy was, the faster it was moving away from us, indicating the expansion of the universe.

What Two Quantities Did Edwin Hubble Compare for a Sample