Planets form within the circumstellar disks around Young Stellar Objects (YSOs), and the evolution of those disks influences the types of planets that form within. Stellar feedback (radiation, winds, jets, outflows, etc.) from nearby stars influences this process. In particular, outside-in photoevaporation caused by UV radiation from nearby high-mass (i.e. O and B) stars shortens the disk lifetime. To sample the typical birth environment of the average low-mass star in the Milky Way, we have constructed a deep survey of YSOs in the Omega Nebula, M17, using Near IR photometry from the HAWK-I instrument on the VLT and data from the MYStIX catalog of X-ray sources. M17 contains hundreds of YSOs experiencing levels of external UV radiation varying by orders of magnitude, allowing us to determine the disk fraction and examine the dependence of disk lifetime on incident radiation.
