An Astronomer Is Interested in a Galaxy Called M31, the Nearest

question 11

Multiple Choice

An astronomer is interested in a galaxy called M31, the nearest galaxy that resembles our Milky Way. It is about 2 million lightyears away. Which technique would be able to give us a distance to this galaxy?

• A) parallax
• B) radar reflections
• C) period-luminosity relation for Cepheid variables
• D) Kepler's laws
• E) you can't fool me: there is no way at present to get a distance to an object so far away

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