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A comprehensive picture of high-mass star formation has remained elusive, inpart because examples of high-mass YSOs tend to be relatively distant, deeplyembedded, and confused with other emission sources. These factors have impededdynamical investigations within tens of AU of high-mass YSOs--scales that arecritical for probing the interfaces where outflows from accretion disks arelaunched and collimated. Using observations of SiO masers obtained with the VLAand the VLBA, the KaLYPSO project is overcoming these limitations by mappingthe structure and dynamical/temporal evolution of the material 10-1000 AU fromthe nearest high-mass YSO: Radio Source I in the Orion BN/KL region. Our datainclude ~40 epochs of VLBA observations over a several-year period, allowing usto track the proper motions of individual SiO maser spots and to monitorchanges in the physical conditions of the emitting material with time.Ultimately these data will provide 3-D maps of the outflow structure overapproximately 30% of the outflow crossing time. Here we summarize recentresults from the KaLYPSO project, including evidence that high-mass starformation is occurring via disk-mediated accretion.

A Documentary of High-Mass Star Formation: Probing the Dynamical Evolution of Orion Source I on 10-100 AU Scales using SiO Masers