New Frontier - The Planet Makers

From the beginnings of our Solar System four and half billion years ago there remains tantalizing clues to its evolution; remnent debris: asteroids and comets. They vary in size from grains of dust to mountain sides, footballs to planetoids. They were the building blocks of the planets and perhaps carry the origins of life itself. Now within our grasp these rocks of ice and dust are ready to give up their secrets.