  Planetary debris disks around other stars are analogous to the Asteroid and
Kuiper belts in the Solar System. Their structure reveals the configuration of
small bodies and provides hints for the presence of planets. The nearby star
Fomalhaut hosts one of the most prominent debris disks, resolved by HST,
Spitzer, Herschel, and ALMA. Images of this system at mid-infrared wavelengths
using JWST/MIRI not only show the narrow Kuiper-Belt-analog outer ring, but
also that (1) what was thought from indirect evidence to be an asteroid-analog
structure is instead broad, extending outward into the outer system; (2) there
is an intermediate belt, probably shepherded by an unseen planet. The newly
discovered belt is demarcated by an inner gap, located at ~ 78 au, and it is
misaligned relative to the outer belt. The previously known collisionally
generated dust cloud, Fomalhaut b, could have originated from this belt,
suggesting increased dynamical stirring and collision rates there. We also
discovered a large dust cloud within the outer ring, possible evidence of
another dust-creating collision. Taken together with previous observations,
Fomalhaut appears to be the site of a complex and possibly dynamically active
planetary system.
