What method is used to determine the distances of very remote galaxies?
A) measurement of the apparent magnitudes of Type Ia supernovae in the galaxies
B) comparison of the apparent and absolute magnitudes of the galaxies
C) measurement of the apparent brightness and period of Cepheid variable stars in the galaxies
D) measurement of the angular size of a galaxy and an assumption about the actual physical size of the galaxy

Question

Quizplus · Accepted Answer

Type Ia supernovae serve as standard candles for measuring astronomical distances because their intrinsic luminosity is well understood, allowing astronomers to determine the distance of galaxies in which they occur by comparing their observed brightness to their known true brightness.

What Method Is Used to Determine the Distances of Very