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Space travel is definitely bad for astronauts’ bones, reducing their bone density after only a month...

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The food they eat in space.  The drinks they take in space.  The temperature in space.  The gravity in spac  
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The food they eat in space.  The drinks they take in space.  The temperature in space.  The gravity in space.  
the BMD loss may cause serious illness to astronauts  the BMI) loss may cause some change in astronauts’ bodies  astronauts shouldn’t care about the BMD loss  astronauts should take some calcium before space travel  
they only cared for the Russian astronauts  they were not interested in their own astronauts  the Russian government invited them to do their research  the Russian astronauts worked in space for a long time  
they only cared for the Russian astronauts  they were not interested in their own astronauts  the Russian government invited them to do their research  the Russian astronauts worked in space for a long time  
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