A 1:4 scale model of the Rosetta lander at ILA2002. The Rosetta lander will study the composition and structure of a comet nucleus material, when landing on the comet in 2014. Measurement goals include the determination of the elemental, molecular, mineralogical, and isotopic composition of the comet's surface and subsurface material. Comets are believed to be the most primitive objects in the Solar System, holding many clues about our Sun and its planets.