Christine is deeply interested in understanding the late stages of planetary system formation and evolution to determine whether planetary systems like our own are common or rare. For example, the terrestrial planets in our Solar System were built during a series of sometimes violent collisions that created debris gas and dust. Recent results from the Kepler Mission indicate that terrestrial planets are common. Do exo-Earths around other stars also form via oligarchic growth and giant collisions? Observations of the outer planets and KBOs in our Solar System indicate that giant planets migrated during the period of Late Heavy Bombardment, destabilizing asteroids in the Main Asteroid belt and delivering water-rich asteroids to Earth. Are exo-Earths water-rich? If so, how and when is water delivered to them? Christine uses multi-wavelength observations to constrain the composition and location of dust and therefore the history of exo-planetary systems.