  Dust measurements in the outer solar system are reviewed. Only the plasma
wave instrument on board Voyagers 1 and 2 recorded impacts in the
Edgeworth-Kuiper belt (EKB). Pioneers 10 and 11 measured a constant dust flux
of 10-micron-sized particles out to 20 AU. Dust detectors on board Ulysses and
Galileo uniquely identified micron-sized interstellar grains passing through
the planetary system. Impacts of interstellar dust grains onto big EKB objects
generate at least about a ton per second of micron-sized secondaries that are
dispersed by Poynting-Robertson effect and Lorentz force. We conclude that
impacts of interstellar particles are also responsible for the loss of dust
grains at the inner edge of the EKB. While new dust measurements in the EKB are
in an early planning stage, several missions (Cassini and STARDUST) are en
route to analyze interstellar dust in much more detail.
