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This was the start of the space race (Lapham's Quarterly, 2014, pg 568).
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This was the date of the Sputnik 1 launched (Homer Hickam, 1998, pg 571).
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Laika the dog was one of the first animals in space (Michael D'Antonio, 2007, pg 575).
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This was one of the first monkeys in space (Christopher C. Kraft, Jr., and James L. Schefter, 2001, pg 614-615.
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The first woman to ever go into space was on her way (Francis French and Colin Burgess, 2007, pg 586).
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President Kennedy addressed the national space effort (John F. Kennedy, 1962, pg 582).
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When Apollo 11 / Saturn 5 climbs toward orbit (NASA, 1969, pg 579)
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This was a big event because the people who were in space came back down to Earth safely (William Safire, 1969, pg 597).
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This was a celebration for the astronauts who were on the moon and made it back safely (Francis French and Colin Burgess, 2007, pg 586
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This was the first ever flag planted on the moon