A Navy SEAL, medical doctor and NASA astronaut lifted off for an eight-month mission on the International Space Station — and that was just one of the three crewmembers on the trip into Earth orbit.

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Jonny Kim earned his trident and stethoscope before launching with Sergey Ryzhikov and Alexey Zubritsky on Tuesday (April 8). When you purchase through links on our site, we may earn an affiliate ...