It’s more likely that unmanned spacecraft can travel anywhere near light speed before humans do. If Voyager 1, a spacecraft launched in 1977 and now thought to have been the first to ever leave the solar system, were headed to Alpha Centauri, the trip would take more than 70,000 years. Alpha Centauri, one of our closest galactic neighbors, is still 4.35 light-years away. But to go farther, we might have to travel somewhere around the speed of light (186,282 miles per second). Having explored the farthest reaches of our home planet and our closest neighbors, we naturally set our sights on the cosmos. There’s something in human DNA that makes us itch to explore.
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