Dr.X believes that the Hubble constant is H₀ = 55 km/s/Mpc.Dr.Y believes it is H₀ = 80 km/s/Mpc.Which statement below automatically follows?
A)Dr.X believes that the universe is expanding,but Dr.Y does not.
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 is older than Dr.Y believes.
D)Dr.X believes that the universe will someday stop expanding,while Dr.Y believes it will expand forever.
E)Dr.X believes that the universe has a much higher density than Dr.Y believes.

Question

Quizplus · Accepted Answer

The Hubble constant (H₀) is used to estimate the age of the universe by determining the rate at which the universe is expanding. A lower Hubble constant (55 km/s/Mpc) implies a slower expansion rate, suggesting that the universe has been expanding for a longer period, hence is older. Conversely, a higher Hubble constant (80 km/s/Mpc) suggests a faster expansion rate and a younger universe. Therefore, Dr.X, with a lower Hubble constant, believes the universe is older than Dr.Y does.

DrX Believes That the Hubble Constant Is H₀ = 55