For many years scientists figured there were 100 billion stars in the Milky Way, but last year a Yale scientist figured the number was closer to 300 billion stars. Now scientists have estimated the first cosmic census of planets in our galaxy and the numbers are astronomical - at least 50 billion planets in the Milky Way alone and some 500 million of those planets are in what is known as the Goldilocks zone, where the climate is thought to be not-too-hot and not-too-cold, and life could exist.
The numbers were extrapolated from the early results of NASA's Kepler telescope, almost two years though a three-and-a-half year mission which has cost an estimated $600million and that's just our galaxy. Scientists figure there are 100 billion galaxies in the known universe. (I’m guessing that’s a lot.)