Two NASA astronauts will get the green light to leave the International Space Station this week 9-months after they arrived on Boeing’s Starliner spacecraft during a test flight but they’ll be flying back to Earth on a SpaceX vehicle.

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According to the Baylor College of Medicine's Center for Space Medicine, long durations in space can change a person's eyes, including globe flattening, optic disc edema, and vision changes. The Space-Associate Neuro-ocular Syndrome (SANS) is a recognized condition which causes swelling in the back of the eye after a duration in space.