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.
Answer:B
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.