I read the question aloud. "Why has NASA not used this technology before?" Then I read the answer. "NASA's first ion engine was built by Glenn Researc... Center in 1960. Since then, there have been many tests of the technology in the laboratory and some limited tests in space. But no mission has really been willing to use the technology as a primary propulsion system because of the possibility that it might not work, which would mean the failure of an expensive mission and the loss of important. Dad seemed oblivious. Becky totally understood and suggested a way to make it up to Katie. Becky suggested I spend afternoons at the Schumans’ house with Katie. Mom agreed to it right away, provided I’d be home in time for dinner. Becky promised to drive me home each evening. It took a while for Mom and Becky to convince Dad that it was okay with them as long as our grades didn’t suffer from spending our afternoons together, and he reluctantly agreed to let me hang out with Katie after school.. More

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