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How did Harlow Shapley use the period-luminosity relationship of RR Lyrae variables to determine the size of the Milky Way galaxy
Biopsy
A medical test that involves extraction of sample cells or tissues from the body to be examined more closely under a microscope, usually to assess the presence or extent of disease.
Calculi
Commonly called stones; usually composed of mineral salts.
Nocturnal Intermittent Peritoneal Dialysis
A type of kidney dialysis that occurs at night while the patient sleeps, utilizing the patient's peritoneal membrane as the filter.
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