We welcome Dr. Sean Raymond of the Université de Bordeaux, France! His research focuses on planet formation and dynamics. He has worked on terrestrial planet formation, dynamics of extra-solar planetary systems, dynamical instabilities in giant planet systems, tidal evolution, and searches for Near Earth Objects. You can find his blog at planetplanet.net. Check out our website for the full transcript of this podcast, plus the full YouTube version of this episode: https://astrobiology.nasa.gov/ask-an-astrobiologist/episodes/15/