  Studies of dust scattering properties in astrophysical objects with Milky Way
interstellar dust are reviewed. Such objects are reflection nebulae, dark
clouds, and the Diffuse Galactic Light (DGL). To ensure their basic quality,
studies had to satisfy four basic criteria to be included in this review. These
four criteria significantly reduced the scatter in dust properties
measurements, especially in the case of the DGL. Determinations of dust
scattering properties were found to be internally consistent for each object
type as well as consistent between object types. The 2175 A bump is seen as an
absorption feature. Comparisons with dust grain models find general agreement
with significant disagreements at particular wavelengths (especially in the
far-ultraviolet). Finally, unanswered questions and future directions are
enumerated.
