Positron Dynamics is building propulsion systems that use antimatter. From their website: WITH CURRENT PROPULSION TECHNOLOGY IT TAKES DECADES FOR OUR FASTEST SPACECRAFT TO REACH THE EDGE OF OUR SOLAR SYSTEM AND THOUSANDS OF YEARS TO REACH OUR CLOSEST NEIGHBORING STAR; FAR TOO LONG. WE NEED ROCKET ENGINES THAT ARE 1,000 TIMES FASTER. More
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