Hubble's constant, ,represents
A) the rate of expansion of the universe.
B) the speed at which galaxies are moving away from us.
C) the time it takes a galaxy to move twice as far away from us.
D) the size of the universe.

Question

Hubble's constant,  ,represents
A) the rate of expansion of the universe. 
B) the speed at which galaxies are moving away from us. 
C) the time it takes a galaxy to move twice as far away from us. 
D) the size of the universe.

Quizplus · Accepted Answer

Hubble's constant represents the rate of expansion of the universe, or how quickly the space between galaxies is expanding. It is measured in units of kilometers per second per megaparsec.

Hubble's Constant, ,Represents