Earlier this month, NASA's Kepler mission announced that it had discovered the first crop of Earth-sized planets orbiting stars other than our own sun. Five of those Earth-sized planets orbit stars similar to our own sun and have orbits that make it possible to have a range of surface temperatures similar to the range on Earth.
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But how will we one day reach these next potential outposts for human life? The solar system's nearest stellar neighbor, Alpha Centauri, sits 4.5 light years away. Voyager I, currently the farthest human-made object outside our solar system, will have to travel for another 50,000 years before it enters the neighborhood of the stars.
But worry not, space enthusiast, because DARPA, the Defense Advanced Research Projects Agency, is already making plans for future interstellar travel.