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19.3 Variable stars: one key to cosmic distances  (Page 6/8)

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    period-luminosity relation

    an empirical relation between the periods and luminosities of certain variable stars

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Practice Key Terms 5

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Source:  OpenStax, Astronomy. OpenStax CNX. Apr 12, 2017 Download for free at http://cnx.org/content/col11992/1.13
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