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CommentsRocket Science, The Best Inventions Of The Year, Time
"It's hard to find a filling station in space, but it's easy to find methane, abundant on many planets and moons. NASA is taking advantage of that with a methane-fueled [XCOR] rocket (above and in tests at right). Future probes could save weight by carrying a little fuel, then gassing up en route just like any long-distance traveler."
