Astronomers Discover a Planet Almost Identical to Earth

Astronomers Discover a Planet Almost Identical to Earth - Yahoo! News: "Just over a week after astronomers boldly announced that they would discover an Earth twin elsewhere in the universe within the year, NASA's Kepler telescop spotted a pretty good candidate. Unglamorously named KOI 172.02 -- KOI stands for Kepler Object of Interest -- this planet is the most Earth-like planet astronomers have discovered yet."