Counting down to a mission to Mars
Science editor Alan Boyle's Weblog: Now that the International Space Station is complete, NASA is touting it as a test bed for future voyages to Mars. But when will those voyages start?Science editor Alan Boyle's Weblog: Now that the International Space Station is complete, NASA is touting it as a test bed for future voyages to Mars. But when will those voyages start?
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