I will present a summary of recent results from the Spitzer Legacy science program, <br />
the Formation and Evolution of Planetary Systems (FEPS, http://feps.as.arizona.edu). <br />
FEPS program samples 328 sun-like systems (0.7 Msun - 2.2 Msun) in age ranging from <br />
3 Myr to 3 Gyr. We trace the evolution of circumstellar dust from primordial <br />
planet-building stages in young circumstellar disks through to older collisionally <br />
generated debris disks. Our goal is to help define the timescales over which <br />
terrestrial and gas giant planets are built, constrain the frequency of planetesimal <br />
collisions as a function of time, and establish the diversity of mature planetary <br />
architectures. The FEPS team has obtained spectro-photometric observations for <br />
all our sample stars using all three science instruments (IRAC, IRS, MIPS) aboard <br />
the Spitzer Space Telescope from 3.6 micron to 70 micron. I will review recent <br />
FEPS results including: 1) complete census of 70 micron-bright debris disks; <br />
2) constraints on dissipation of primordial disks in terrestrial planet zones <br />
around stars younger than 30 Myr; and 3) properties and evolution of circumstellar <br />
dust around 314 solar-type stars.