Using a brand new and totally out of this world statistical astrophysical mathematical approach, NASA's Kepler mission has announced the discovery of 715 new planets -- almost doubling the total number of known exoplanets to nearly 1,700. These planets orbit just 305 stars, meaning they belong to multiple-planet solar systems just like our own -- and, perhaps excitingly, nearly all of the planets are smaller than Neptune, which is only four times larger than Earth (most planets discovered before now have been much larger and not Earth-like).