  In its 16 years of scientific measurements, the Spitzer Space Telescope
performed a number of ground-breaking infrared measurements of Solar System
objects. In this second of two papers, we describe results from Spitzer
observations of asteroids, dust rings, and planets that provide new insight
into the formation and evolution of our Solar System. The key Spitzer results
presented here can be grouped into three broad classes: characterizing the
physical properties of asteroids, notably including a large survey of Near
Earth Objects; detection and characterization of several dust/debris disks in
the Solar System; and comprehensive characterization of ice giant (Uranus,
Neptune) atmospheres. Many of these observations provide critical foundations
for future infrared space-based observations.
