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If DM-matter scatterings are assumed to occur in a detector's targetmaterial, collisions will naturally take place inside the bulk of planets andstars as well. For large cross sections, these scatterings might occur in theEarth or Sun even prior to the detection. In this thesis, we study the impactof these pre-detection scatterings on direct searches of light DM with the useof Monte Carlo (MC) simulations. By simulating the trajectories and scatteringsof many individual DM particles in the Earth or Sun, we determine the localdistortions of the statistical properties of DM at any detector caused byelastic DM-nucleus collisions. Scatterings inside the Earth distort theunderground DM density and velocity distribution. Any detector movesperiodically through these inhomogeneities due to the Earth's rotation, and theexpected event rate will vary throughout a sidereal day. Using MC simulations,we can determine the exact amplitude and phase of this diurnal modulation forany experiment. For even higher scattering probabilities, collisions in theoverburden above the typically underground detectors start to attenuate theincoming DM flux. The critical cross section above which an experiment losessensitivity to DM itself is determined for a variety of DM-nucleus andDM-electron scattering experiments and different interaction types.Furthermore, we develop the idea that sub-GeV DM particles can enter the Sun,gain kinetic energy by colliding on hot nuclei and get reflected with greatspeeds. By deriving an analytic expressions for the particle flux from solarreflection via a single scattering, we demonstrate the prospects of futureexperiments to probe reflected DM and extend their sensitivity to lower massesthan accessible by halo DM alone. Finally, we present first results for MCsimulations of solar reflections taking into account the effect of multiplescatterings.

Dark Matter in the Earth and the Sun -- Simulating Underground Scatterings for the Direct Detection of Low-Mass Dark Matter