It was a discovery nearly a century in the making, but astronomers have finally detected a planet around Barnard’s Star, the nearest single star to Earth. Known as the "white whale" of exoplanet hunters, Barnard's Star has long tantalized and frustrated astronomers with false results of planetary detection, and it inspired a generation of science fiction writers to imagine what kind of worlds lie in its feeble gravitational embrace. The newly discovered planet isn't exactly an Earth-like, but it is the second-nearest exoplanet to our solar system and it's probably twice the age of our own solar system. Here are the details...