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NASA has found that the height of astronauts increases approximately 3% over the first 3 to 4 days of weightlessness in space. There are many factors that influence each individual, so each astronaut will experience more or less of an increase than others.
Astronauts in space can grow up to 3 percent taller during the time spent living in microgravity, NASA scientists say. That means that a 6-foot-tall (1.8 meters) person could gain as many as 2 inches (5 centimeters)