We haven't built a spacecraft that can reach nearby stars within a human lifetime.
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United States, North America
Even our fastest probes would take tens of thousands of years to reach the nearest star system. Without a breakthrough in propulsion, interstellar travel remains purely theoretical.
Citation ID: WS00010
Title: We haven't built a spacecraft that can reach nearby stars within a human lifetime.
URL: https://www.worldsolve.org/index.php?api=problem&id=10