WASHINGTON — Space is vast, but it may not be so lonely after all: A study finds the Milky Way is teeming with billions of planets that are about the size of Earth, orbit stars just like our sun, and exist in the Goldilocks zone — not too hot and not too cold for life…

Source: http://www.nbcnews.com/science/space/8-8-billion-habitable-earth-size-planets-exist-milky-way-f8C11529186