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'Everything about being in space was a big unknown'
Former astronaut, John Glenn, who was the oldest man to travel to space and the first American to orbit the earth, dies aged 95. He also served as a US senator and a combat pilot. Dan Damon asked former NASA astronaut Dr Nicholas Patrick to name John Glenn's greatest achievement.
(Photo: US astronaut John Glenn. Credit: ROBERTO SCHMIDT/AFP/Getty Images)
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