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Title: Why are Cepheid variable stars important for the study of the expansion of the universe?(a)There is ... Post by: symbo on Mar 21, 2017 Why are Cepheid variable stars important for the study of the expansion of the universe?
(a) There is a well-defined relationship between their period of oscillation and their intrinsic brightness. (b) They are so bright that they can be seen in even the most distant galaxies. (c) They provide a set of sharp absorption lines with which the Doppler shift of the galaxy can be measured. Title: Re: Why are Cepheid variable stars important for the study of the expansion of the universe?(a)There ... Post by: discoverer on Mar 21, 2017 Content hidden
Title: Re: Why are Cepheid variable stars important for the study of the expansion of the universe?(a)There is ... Post by: symbo on Jul 10, 2017 Very informative, I appreciate the extra effort
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