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

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

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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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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

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

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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.

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

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

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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this article is interesting -- must research more but its presentation is quite lovely - how there is a strange symmetry in the earth and its environs...i.e. the moon and sun...

this article is interesting -- must research more but its presentation is quite lovely - how there is a strange symmetry in the earth and its environs...i.e. the moon and sun...

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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)

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

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On March 17, the MESSENGER spacecraft became the first to orbit Mercury, the solar system's innermost planet. This is its first processed color image since entering Mercury orbit. Larger, denser, and with almost twice the surface gravity of Earth's moon, Mercury still looks moon-like at first glance.

On March 17, the MESSENGER spacecraft became the first to orbit Mercury, the solar system's innermost planet. This is its first processed color image since entering Mercury orbit. Larger, denser, and with almost twice the surface gravity of Earth's moon, Mercury still looks moon-like at first glance.

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