NASA astronauts health risks spaceflight

European Space Agency astronaut Christer Fuglesang is visible in the reflection of NASA astronaut Danny Olivas' helmet visor during the STS-128 mission's third spacewalk. NASA, which plans to send astronauts to an asteroid or to Mars in the next few decades, requested a report from the Institute of Medicine that would help lay out an ethics framework for weighing such missions with high potential health risk. The report was released Wednesday.
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