When Henrietta Leavitt discovered the period-luminosity relationship, she used Cepheid variable stars that were all located in the Large Magellanic Cloud (LMC). It was (easier / more difficult) to compare Cepheids in the LMC rather than those located in the Milky Way Galaxy because they are all (about the same distance away / located at widely varying distances from Earth). As a result (differences in apparent brightness are directly related to differences in intrinsic brightness of these stars / all of these stars have the same Doppler shift / all of these stars have the same proper motion)
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