How did Edwin Hubble measure the distance to the Andromeda Galaxy?
A)He measured its parallax.
B)He applied the period-luminosity relation to Cepheid variables.
C)He deduced it from its redshift.
D)He used white dwarf supernovae.

Question

Quizplus · Accepted Answer

Edwin Hubble used the period-luminosity relation to Cepheid variables to measure the distance to the Andromeda Galaxy. This method involves measuring the brightness and pulsation period of Cepheid variable stars in the galaxy, which allows astronomers to determine their intrinsic brightness and therefore calculate the distance to the galaxy.

How Did Edwin Hubble Measure the Distance to the Andromeda