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Home Q & A Board Science-Related Homework Help Physics
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symbo symbo
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7 years ago
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.
Textbook 
Discovering the Universe

Discovering the Universe


Edition: 7th
Authors:
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discovererdiscoverer
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7 years ago
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symbo Author
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#2
6 years ago
Very informative, I appreciate the extra effort
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