Henrietta Swan Leavitt

Henrietta Leavitt was an American astronomer who discovered the relation between the luminosity and the period of Cepheid variables. This was a vital step in measuring the distance to remote galaxies.

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Helen Keller

Undeterred by deafness and blindness, Helen Keller rose to become a major 20th century humanitarian, educator and writer. She advocated for the blind and for women’s suffrage and co-founded the American Civil Liberties Union.

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Juliette Gordon Low

Known as the founder of the Girl Scouts, Juliette Gordon Low created the largest and most successful organization for girls in the world. She is best remembered for her sheer determination and tireless efforts to promote and sustain the organization through the early part of the twentieth century.

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Annie Jump Cannon

Known as the “census taker of the sky,” Annie Jump Cannon was a brilliant astronomer that revolutionized the way scientists classify stars. Not only did she develop the important Harvard spectral system, she also classified about 350,000 stars manually. She became the first woman to receive a Doctor of Astronomy degree from Groningen University, the first woman ever to receive an honorary degree from Oxford University, and in 1931 she became the first woman to be awarded the Henry Draper Medal of honor from the National Academy of Sciences.

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