Around the star Gliese 667C, 22 light years from Earth, astronomers have discovered a solar system with 6 to 7 planets-- three of which orbit that sun's habitable zone. That's the most exoplanets in a star's habitable zone that have been found yet. The three worlds, labeled "super Earths," are much larger than our planet but smaller than Neptune or Uranus. More at The Atlantic.