Dr. X believes that the Hubble constant is H0 = 20 km/s/Mly while Dr. Y believes it is H0 = 24 km/s/Mly. Which statement below automatically follows?
A)Dr. X believes that the universe is older than Dr. Y believes.
B)Dr. X believes that the Andromeda Galaxy (a member of our Local Group)is moving away from us at a slower speed than Dr. Y believes.
C)Dr. X believes that the universe has a much higher density than Dr. Y believes.
D)Dr. X believes that the universe is expanding, but Dr. Y does not.
E)Dr. X believes that the universe will someday stop expanding, while Dr. Y believes it will expand forever.

Question

Quizplus · Accepted Answer

The Hubble constant (H0) is a measure of the rate of expansion of the universe. A lower value of H0 implies a slower rate of expansion, which in turn suggests that the universe has been expanding for a longer period of time. Therefore, if Dr. X believes H0 = 20 km/s/Mly, which is lower than Dr. Y's belief of H0 = 24 km/s/Mly, it follows that Dr. X believes the universe is older than Dr. Y does.

Dr X Believes That the Hubble Constant Is H0 =