Astronomers reported that there could be as many as 40 billion habitable Earth-size planets in the galaxy, based on a new analysis of data from NASA's Kepler spacecraft.
MORE: http://www.nytimes.com/2013/11/05/science/cosmic-census-finds-billions-of-planets-that-could-be-like-earth.html?hp&_r=3&
See also...
Tens of billions of planets out there are like Earth, study finds
http://www.cnn.com/2013/11/05/tech/innovation/billions-of-planets/index.html?hpt=us_bn4
