"Standard candles," which are important for finding distances to remote galaxies,are
A) standard laboratory light sources with which the brightness of a galaxy can be compared.
B) heat sources used for calibrating infrared observations of galaxies.
C) stars and other objects of known intrinsic brightness.
D) laboratory light sources with a well-known spectrum for calibration of stellar and galactic spectra.

Question

Quizplus · Accepted Answer

Standard candles are objects of known intrinsic brightness, typically stars, that can be used to measure distances to remote galaxies. By comparing the observed brightness of a standard candle in a distant galaxy to its known intrinsic brightness, astronomers can determine how far away the galaxy is.

"Standard Candles," Which Are Important for Finding Distances to Remote