15 h, may 14, 1984 y - In 1984, President Ronald Reagan announced the Teacher in Space Project, and McAuliffe learned about NASA's efforts to find their first civilian, an educator, to fly into space
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https://en.wikipedia.org/wiki/Christa_McAuliffeAdded to timeline:
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15 h, may 14, 1984 y
Now
~ 42 years ago