The crew of the International Space Station was forced to activate back-up oxygen generating equipment on Wednesday after the ISS’s main supply system broke down.Russian engineers are struggling to repair the main “Elektron” oxygen supply system, which is located in the Russian Zvezda living module. The system converts water into hydrogen and oxygen.

Both Russian and U.S. officials say the crew is in no danger. Secondary oxygen supplies should last for at least 100 days and a shuttle mission is scheduled to bring fresh supplies to the station in early June.
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After almost two years of negotiations, NASA and its International Space Station partners released a new set of ground rules for the selection of non-professional visitors to the orbiting outpost. The rules emphasize what kind of conduct is unbecoming enough to bar visiting researchers or millionaire tourists from making round trips to the complex.
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