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

question 28

Multiple Choice

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

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