A cepheid variable has been found to have a period of 22, Ask an Expert

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A Cepheid variable has been found to have a period of 22 days, from this its luminosity is determined to be 2.8 x 1029 W (720 solar luminosities). The apparent magnitude of the Cepheid is 3.7 while that of the Sun is -26.74. Use this information to calculate the distance to the Cepheid.

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