Harvard University Medical School graduate, Jim Yong Kim, an emergency medicine resident at Massachusetts General Hospital and former Navy SEAL, was named as part of NASA's new astronaut class.. Rose Lincoln/Harvard Staff Photographer

Jonny Kim was in the grocery store when the call came: He would have to exchange his emergency room scrubs for a space suit.
“I was happy, jubilated, excited — all these emotions,” Kim said. “My wife was there. I told her and she was jumping up and down in the grocery store. So we looked silly. I was about to pay for the food.”
Kim, a 2016 Harvard Medical School (HMS) graduate, was one of a dozen candidates picked by NASA in June for its next astronaut class. A year into a four-year residency at Massachusetts General Hospital (MGH), Kim will put his medical career on hold so he can learn to fly a plane, spacewalk, operate the International Space Station’s robotic arm, and master other skills NASA considers essential.
This isn’t the first time Kim has exchanged one high-pressure career for another. Before going on inactive reserve to pursue his medical training, …
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