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Title: What useful purpose did variable stars serve for Harlow Shapley in locating the galactic ... Post by: doit_the_clown on Mar 20, 2017 What useful purpose did variable stars serve for Harlow Shapley in locating the galactic center?
A) They are important spiral arm tracers and thus defined the shape of the Galaxy. B) Their brightness variations allowed accurate distances to be measured. C) They emit copious amounts of infrared radiation and are thus visible through interstellar dust that obscures visible light. D) They are concentrated in the galactic center and so defined its direction. Title: Re: What useful purpose did variable stars serve for Harlow Shapley in locating the galactic ... Post by: discoverer on Mar 20, 2017 Content hidden
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