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We have calculated models for the expected small-grain population of the Kuiper Belt in equilibrium between production by collisions of comet nuclei and destruction by processes of Poynting-Robertson drag, mutual collisions, radiation pressure ejection, and sublimation. The surface brightness of thermal radiation from these grains at a wavelength of 60 $\mu$m viewed from earth would be less than, but comparable to, that observed from foreground zodiacal dust if the comet parent population has mass of order 0.1 $M_{\earth}$, given simple assumptions about the comets' size, spatial distribution, material density, and fragment size spectrum. We will also present preliminary results from a search in the COBE DIRBE data for emission which might be attributable to material in the plane of the solar system beyond Neptune/Pluto.
