  We report several results related to the dynamical evolution of dust produced
in the Kuiper Belt (KB). We show that its particle size frequency distribution
in space is greatly changed from the distribution at production, as a results
of the combined effects of radiation forces and the perturbations of the
planets. We estimate the contribution of KB dust to the zodiacal cloud by
calculating the radial profile of its number density near the ecliptic. We also
study the contribution of KB dust to the population of interplanetary dust
particles (IDPs) collected at Earth, by calculating geocentric encounter
velocities and capture rates. Our models show, in contrast with previous
studies, that KB dust grains on Earth-crossing orbits have high eccentricities
and inclinations and, therefore, their encounter velocities are similar to
those of cometary grains and not to asteroidal grains. We estimate that at most
25% in number of captured IDPs have cometary or KB origin; the KB contribution
may be as low as 1%-2%. We present the velocity field of KB dust throughout the
solar system; this, together with the number density radial profile, is
potentially useful for planning spacecraft missions to the outer solar system.
