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There is talk in the scientific community of a manned Mars mission: sending an elderly couple to slingshot past Mars and return to Earth as a trial mission, toward eventual other missions that will land there in the future. The mission would last around 300 days.

What would be the halachic challenges that the couple could face on a day-to-day basis? (This question doesn't ask whether space exploration/travel is halachically desirable.)

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I assume you mean challenges that are unique to space travel (meaning kosher food is not the answer you are looking for). –  Double AA Aug 21 '13 at 22:29
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Good thing they are elderly or Mikva would be a big problem. –  Double AA Aug 21 '13 at 22:30
    
@DoubleAA see judaism.stackexchange.com/questions/26921/… –  Shmuel Brin Aug 21 '13 at 22:40
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Perhaps kosher food would be a problem. Space food often consists of powdered food that needs hydration. It may not be possible, for health reasons, to provide a balanced diet using novel space food storage techniques. I don't know! –  bondonk Aug 21 '13 at 23:01
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I know there are disagreements over how often you would need to pray in space. This could cause problems, especially since you would be required to keep to an exercise regime when on board. Chagim? –  bondonk Aug 21 '13 at 23:03
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