Chinese researchers claim they've confirmed the theory behind an "impossible" space drive, and are proceeding to build a demonstration version. If they're right, this might transform the economics of satellites, open up new possibilities for space exploration –- and give the Chinese a decisive military advantage in space.
To say that the "Emdrive" (short for "electromagnetic drive") concept is controversial would be an understatement.China has at least a year's head start in a technology that will dominate space and make previous satellites as obsolete as sailing ships in the age of steam.
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