planets that are out there richer very abundant that they are somewhat larger than the earth but not bin jupiter. there could be such things but we did not know for sure. we did not know about those worlds. what does that mean for life? >> it shows that we are unique maybe we're in a special circumstance. >> guest: it is one piece of evidence to suggest we're not quite as mediocre to connect that to the presence ofn2i life is very difficult for us. we really don't know what is necessary to put into place. just to use as an example as a template. looked at the history of life on earth. and passed to line up. with that planetary environment. with that history of biology >> is there the ingredient list? men life can no curb but is that something that is conjecture? >> guest: not really. because if we had the magic formula. in view of their own history then we argue nature is [laughter] >> it is a dangerous place. [laughter] the part of the difficulty is these are all things that take on meanings after words part of the argument i make in the book as we could sit on another planet with the different