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The NASA New Horizons Venetia Burney Student Dust Counter (SDC) measures dustparticle impacts along the spacecraft's flight path for grains with mass $\ge$$10^{-12}$ g, mapping out their spatial density distribution. We present thelatest SDC dust density, size distribution, and flux measurements through 55 auand compare them to numerical model predictions. Kuiper Belt Objects (KBOs) arethought to be the dominant source of interplanetary dust particles (IDP) in theouter solar system due to both collisions between KBOs, and their continualbombardment by interstellar dust particles (ISD).  Continued measurements through 55 au show higher than model-predicted dustfluxes as New Horizons approaches the putative outer edge of the Kuiper Belt(KB). We discuss potential explanations for the growing deviation: radiationpressure stretches the dust distribution to further heliocentric distances thanits parent body distribution; icy dust grains undergo photo-sputtering thatrapidly increases their response to radiation pressure forces and pushes themfurther away from the sun; and the distribution of KBOs may extend much furtherthan existing observations suggest. Ongoing SDC measurements at even largerheliocentric distances will continue to constrain the contributions of dustproduction in the KB. Continued SDC measurements remain crucial forunderstanding the Kuiper Belt and the interpretation of observations of dustdisks around other stars.

New Horizons Venetia Burney Student Dust Counter Observes Higher than Expected Fluxes Approaching 60 AU