When Kepler launched in March 2009, scientists didn’t know how common planets were beyond our solar system. Thanks to Kepler’s treasure trove of discoveries, astronomers now believe there may be at least one planet orbiting every star in the sky.

     Makes sense to me when looking at the sheer probabilities of the likelihood of our earth.  That we live on a ball of dirt that has exactly the right balance of elements and compounds, and gravity, and energy from a nearby star must have been one of countless similar planets that almost had the right balance.   
    Or, now to consider the likelihood that there are more planets that found a working balance for life.  Pretty cool.