What crucial relationship concerning luminosity did Henrietta Leavitt establish regarding Cepheid variable stars?
Answer
The period of a Cepheid variable star's pulsation is directly related to its true intrinsic brightness.
Henrietta Leavitt discovered that the time it takes for a Cepheid variable star to complete one cycle of brightening and dimming is directly proportional to how intrinsically bright that star actually is.
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