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Emily Calandrelli on Twitter: "Remembering our fallen explorers: Apollo 1, Space Shuttle Challenger, Space Shuttle Columbia. Per aspera ad astra. http://t.co/611icKD8Wa"
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For astronauts Gus Grissom, Ed White, and Roger Chaffee that lost their lives on January 27, 1967. | Apollo 1, Nasa history, Space nasa
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