What distance method did Edwin Hubble use to determine the distance to local galaxies
A)Hubble law
B)supernova observations
C)period-luminosity relationship of variable stars
D)parallax

Question

Quizplus · Accepted Answer

Edwin Hubble used the period-luminosity relationship of Cepheid variable stars to determine the distance to local galaxies. He observed the fluctuation in brightness of these stars and used their known period-luminosity relationship to calculate their distance. The Hubble law was developed later by Hubble and associates and is based on the redshift of light from distant galaxies. Supernova observations can also be used to determine distances to galaxies, but this method was not available to Hubble during his time. Parallax is a method used to determine the distance to nearby stars and is not applicable to galaxies.

What Distance Method Did Edwin Hubble Use to Determine the Distance