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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Bright: This enhanced photo image of Mercury the Messenger probe was taken during a flyby of the planet in 2008. Nasa said more stunning pictures could emerge after the probe entered Mercury's orbit

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Earth and Moon from Mercury orbit, with Moon entering eclipse. Imaged on Wednesday, October 8, 2014 by MESSENGER, a spacecraft in orbit around Mercury.

Four views of planet Mercury showing surface detail by NASA: MESSENGER's highly successful orbital mission camae to an end, as the spacecraft ran out of propellant and the force of solar gravity caused it to impact the surface of Mercury on April 30, 2015. #Space #Mars #Mercury_Messenger

The Golden Age of NASA Infographic | shared by mattb434 | Dec 04, 2014 | in Science | Every US space mission from Mercury to Apollo-Soyuz with astronauts color-coded by selection group.

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MESSENGER Completes Second Burn to Maintain Mercury Orbit by JASON MAJOR o9/22/14 Illustration of MESSENGER in orbit around Mercury (NASA/JPL/APL)

Mercury is the closest planet to the sun and has a thin atmosphere, no air pressure and an extremely high temperature.

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