Spacesuit engineers demonstrate how four crew members would be arranged for launch inside the Orion spacecraft, using a mockup of the vehicle at Johnson Space Center. Credits: NASA/Robert Markowitz

Spacesuit engineers demonstrate how four crew members would be arranged for launch inside the Orion spacecraft, using a mockup of the vehicle at Johnson Space Center. Credits: NASA/Robert Markowitz

A return to deep space-Today's flight, called Exploration Flight Test-1, marks the first time a spacecraft built for humans has traveled out of low-Earth orbit since Apollo 17 launched to the moon in 1972. Diagrams show first flight test of Orion capsule.

A return to deep space-Today's flight, called Exploration Flight Test-1, marks the first time a spacecraft built for humans has traveled out of low-Earth orbit since Apollo 17 launched to the moon in 1972. Diagrams show first flight test of Orion capsule.

Nov. 19, 1969, Apollo 12 Lunar Module Intrepid - The Apollo 12 Lunar Module (LM), in a lunar landing configuration, is photographed in lunar orbit from the Command and Service Modules (CSM) on Nov. 19, 1969. Aboard the LM were astronauts Charles Conrad Jr., commander; and Alan L. Bean, lunar module pilot.

Nov. 19, 1969, Apollo 12 Lunar Module Intrepid - The Apollo 12 Lunar Module (LM), in a lunar landing configuration, is photographed in lunar orbit from the Command and Service Modules (CSM) on Nov. 19, 1969. Aboard the LM were astronauts Charles Conrad Jr., commander; and Alan L. Bean, lunar module pilot.

Orion Explained : NASA's Multi-Purpose Crew Vehicle (Infographic) - by : Karl Tate, SPACE.com Infographics Artist

Orion Explained : NASA's Multi-Purpose Crew Vehicle (Infographic) - by : Karl Tate, SPACE.com Infographics Artist

Earth from ISS-Earth's thin atmosphere stands out against the blackness of space in this photo shared on Aug. 31, 2015, by NASA astronaut Scott Kelly on board the International Space Station. The station's solar panels can be seen in darkness at the right of the image.

Earth from ISS-Earth's thin atmosphere stands out against the blackness of space in this photo shared on Aug. 31, 2015, by NASA astronaut Scott Kelly on board the International Space Station. The station's solar panels can be seen in darkness at the right of the image.

Many layers and systems combine to keep astronauts alive in the vacuum of space. See how NASA's Extravehicular Mobility Unit (EMU) spacesuits work in this Space.com infographic.

Many layers and systems combine to keep astronauts alive in the vacuum of space. See how NASA's Extravehicular Mobility Unit (EMU) spacesuits work in this Space.com infographic.

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