Costa Rica's Radical Rocket

Getting to Mars' or anywhere else in the solar system-may be easier with Ad Astra Rocket Co.'s plasma thruster

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Photo: Randi Silberman
AGAINST THE ODDS: Carlos Martinez Castillo, a native of Nicaragua, was working at a Costa Rican gas station when Ronald Chang Díaz showed up asking if anyone wanted a career in rockets. “I worked at a gas station when I was young, and I wanted to help one of those guys get a good job,” Chang Díaz recalls. Castillo manages the machine shop at Ad Astra and studies information technologies at a nearby university.
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