Saturn and its moons
Katharine Burr Blodgett (1898-1979) First woman to receive a PhD in physics from Cambridge University and inventor of “invisible” (low-reflectance) glass
Project Mercury astronauts at Langley Air Force Base, Virginia: (top, left to right) Alan Shepard, Gus Grissom, Gordon Cooper; (bottom left to right) Wally Schirra, Deke Slayton, John Glenn and Scott Carpenter.
Ralph Morse—Time & Life Pictures/Getty Images
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