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" ... Faster crafts, such as the now-defunct Helios space probes, could theoretically have reached Alpha Centauri in just 19,000 years. But it still would have taken the Helios probes an additional 100,000 to 200,000 years to reach the closest star systems with potentially habitable planets. "We are talking time frames equal to how long homo sapienshave been on this planet," Millis said. ... "