Portrait of Henrietta Swan Leavitt at work in the Harvard College Observatory. (Photo by Margaret Harwood, courtesy of AIP Emilio Segrè Visual Archives, Physics Today Collection, Shapley Collection)
Portrait of Henrietta Swan Leavitt at work in the Harvard College Observatory. (Photo by Margaret Harwood, courtesy of AIP Emilio Segrè Visual Archives, Physics Today Collection, Shapley Collection)