Which two quantities are shown to be related to one another in Hubble's law?
A) distance and brightness
B) brightness and the width of the 21-cm radio emission line of hydrogen
C) brightness and recession velocity
D) distance and redshift of light from the object

Question

Quizplus · Accepted Answer

Hubble's law demonstrates the relationship between the distance of galaxies from Earth and the redshift of light coming from those galaxies, indicating that the universe is expanding.

Which Two Quantities Are Shown to Be Related to One