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Astronauts' Hearts Change Shape in Space

Astronauts who go into space come back with rounder hearts, RedOrbit reports. Scientists who had astronauts regularly take images of their hearts with ultrasound machines found that the organ becomes more spherical in space by a factor of 9.4%. The researchers believe the change in shape, which is temporary, indicates that the heart is performing less efficiently in zero gravity. The study was presented at the American College of Cardiology's 63rd Annual Scientific Session & Expo, which comes to a close today.

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