Astronauts' Hearts Change Shape In Space 113
sciencehabit (1205606) writes "Astronauts who go into space come back with rounder hearts. 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."
Re:Spinning Space stations (Score:5, Insightful)
Spinning stations need to be large in diameter: the smaller the diameter, the faster you have to spin it, and the coriolis force starts to really screw with the people inside it. Great if you want the astronauts throwing up all the time. So spinning stations have to be big, which means expensive.
The alternative is to tether two stations together, but NASA have a history of serious problems with tethers.