Our world felt a little less special on Monday, as NASA's Kepler mission announced the discovery of an "Earth-sized" planet orbiting a "sun-like" star.
Yes, another one.
But this new orb merits special status -- because it's the first planet to be officially confirmed to exist in the so-called "habitable zone." It's an ideal size. It orbits just the right distance from its star, which is a lot like our own sun.
