2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/2625The imaging of disks around young stars presents extreme challenges in high dynamic range, angular resolution, and sensitivity. Recent instrumental advances have met these challenges admirably, leading to a marked increase in imaging discoveries. These have opened up a new era in studies of the origin of planetary systems. Questions about our own solar system's formation, and of the prevalence of extra-solar planets, are now addressed with complementary techniques at different wavelengths. Optical and near-infrared images detail scattered light from disks at the highest possible resolution. Mid-infrared, sub-millimeter, and millimeter-wave techniques probe thermal dust continuum radiation. Millimeter-wave interferometry details the small-scale structure of the molecular gas. Kinematic imaging studies affirm the disk interpretation of mm-wave continuum surveys, and the high incidence rate for solar nebula analogs. Inner holes, azimuthal asymmetries, and gaps suggest the presence of underlying planetary bodies. The combined techniques provide a multi-dimensional picture of disks in time and have strengthened our understanding of the connection between disks and planets. Future progress is assured by the presence of much-improved imaging capability looming on the horizon.Review article to appear in "The 4th Tetons Summer School Conference: "Galactic Structure, Stars, and the Interstellar Medium," ed. C.W. Woodward, M. . Bicay, & J.M. Schull (San Francisco: ASP), 23 page LaTeX file with 7 low-resolution figures. For postscript version with embedded high-resolution figures, retrieve from http://www.hep.upenn.edu/PORG/papers/koerner01a.psAstrophysicstext