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The Jet Propulsion Lab's Explorer 1 launched off on Jan. 31, 1958. It was the first U.S. satellite successfully launched into orbit.
Many scientists were involved in getting Explorer 1 to lift off, and some of the lesser-known people who worked on these satellites were a group of women who worked as "human computers" — doing calculations by hand to support the space experiments.
Author Nathalia Holt has written a new book about these women called "Rise of the Rocket Girls: The Women Who Propelled Us, From Missiles To The Moon To Mars."
Susan Finley, systems engineer and NASA's longest-serving female employee.
This segment aired on April 13, 2016.