HOUSTON — Ad Astra Rocket Co.’s plans to demonstrate the promise of advanced plasma propulsion aboard the International Space Station have slipped from their original target of 2012 to 2015, and now, the company fears, could slip away completely. A small team of scientists and engineers, headquartered in a nondescript converted suburban warehouse here has been laboring to bring Mars and other deep-space destinations within reach of human explorers through the exotic but promising ...


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