Extrapolating data from the Kepler telescope has led to some remarkably large sums. There are at least 50 billion planets in the Milky Way. Of these planets at least one in every hundred is in the Goldilocks zone, so called as it is ‘not too hot and not too cold’… and so 500 million planets in this galaxy alone may be able to support life.
Photo by lrargerich – http://flic.kr/p/8BPQ2q
Read more over at AP