John Glenn's Mercury mission was the first American space flight around the world. #Infographic

John Glenn's Mercury mission was the first American space flight around the world. #Infographic

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Every US space mission from Mercury to Apollo-Soyuz with astronauts color-coded by selection group.

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This enhanced photo image of Mercury the Messenger probe was taken during a flyby of the planet in 2008.

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Concentric circular orbits with reference points, extrapolated perspective, and triangulation.

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