Author Question: Dr. X believes that the Hubble constant is H0 = 20 km/s/Mly while Dr. Y believes it is H0 = 24 ... (Read 86 times)

joe · **on:** Jul 27, 2018

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 expanding, but Dr. Y does not.
B) Dr. X believes that the universe is older 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 will someday stop expanding, while Dr. Y believes it will expand forever.
E) 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.

Question 2

Two stars have the same absolute magnitude, but one lies twice as far from Earth as the other. It will appear half as bright.

Indicate whether the statement is true or false