How did Edwin Hubble measure the distance to the Andromeda Galaxy?
A)He applied the period- luminosity relation to Cepheid variables in Andromeda.
B)He measured its parallax.
C)He detected white dwarf supernovae in Andromeda.
D)He applied main- sequence fitting to star clusters in Andromeda.
E)He measured its redshift and applied Hubble's Law.

Question

Quizplus · Accepted Answer

Hubble used the period-luminosity relationship of Cepheid variable stars in the Andromeda Galaxy to determine its distance. This method involves observing the periodic changes in brightness of these stars, which correlate with their intrinsic luminosity, allowing for the calculation of their distance from Earth.

How Did Edwin Hubble Measure the Distance to the Andromeda