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Resolve the problem without the astronauts leaving the space station. well see what nasa finds. >> thank you very much. >> if it gets really bad and they have to leave and get back to earth, the last man that walked on the moon -- the last man to walk on the moon. i guess thats reality. if we have to leave its in a russian vehicle. >> theres more to it. what you heard was right. theres two complete loops. each has a pump in it. the whole thing keeps everything running smoothly. theyre trying to ...