In Space, Astronaut Hearts Work Less, Shrink, And Become More Spherical

The heart becomes more spherical when exposed to long periods of microgravity in space, according to a study of 12 astronauts. The research has implications if any progress toward a trip to Mars ever gets made. NASA already has a zero-risk culture and cute robots don't have heart attacks whereas a spaceflight of 18 months or more that could affect astronauts' heart strength may be a concern. In space, no one can hear your heartbeats - as easily. The heart works a lot less and that leads to less muscle mass, even over a relatively short duration. read more

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