Finnish Geospatial Research Institute FGI, National Land Survey 1 article published in JoVE Engineering Scattering And Absorption of Light in Planetary Regoliths Karri Muinonen1,2, Timo Väisänen1, Julia Martikainen1, Johannes Markkanen1,3, Antti Penttilä1, Maria Gritsevich1,4, Jouni Peltoniemi1,2, Jürgen Blum5, Joonas Herranen1, Gorden Videen6,7, Göran Maconi1, Petteri Helander1, Ari Salmi1, Ivan Kassamakov1, Edward Haeggström1 1Department of Physics, University of Helsinki, 2Finnish Geospatial Research Institute FGI, National Land Survey, 3Max Planck Institute for Solar System Research, 4Institute of Physics and Technology, Ural Federal University, 5Institut für Geophysik und Extraterrestrische Physik, Technische Universität Braunschweig, 6Space Science Institute, 7Army Research Laboratory Numerical and experimental methods are presented for multiple scattering of light in discrete random media of densely-packed particles. The methods are utilized to interpret the observations of asteroid (4) Vesta and comet 67P/Churyumov-Gerasimenko.