What method would astronomers use to find the distance to a galaxy so far away that individual stars are impossible to make out (resolve)?
A) parallax
B) Cepheid variables
C) using the x-ray emission from the entire galaxy
D) finding the red?shift and using Hubble's Law
E) the turnoff point of the main sequence on an H-R diagram

Question

Quizplus · Accepted Answer

Finding the redshift and using Hubble's Law is the most reliable method to determine distance to very distant galaxies where individual stars cannot be resolved. Hubble's Law relates the distance to the redshift of the galaxy, allowing for an accurate estimation of distances even for galaxies beyond our ability to observe individual stars.

What Method Would Astronomers Use to Find the Distance to a Galaxy