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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) while in orbit.

While scientists have known for some time that astronauts experience a slight height boost during a months-long stay on the International Space Station, NASA is only now starting to use ultrasound technology to see exactly what happens to astronauts' spines in microgravity as it occurs.