Planets form in protoplanetary disks around young stars. As most young stars form in cluster environments, planet forming disks are exposed to various levels of external UV radiation. Such external UV radiation plays an important role in protoplanetary disk evolution affecting disk lifetime, disk properties, and planet formation. Photoevpaorating protoplanetary disks (proplyds) are found near O stars in the Orion Nebula Cluster (ONC), which harbors over hundreds of them. We have identified more proplyds around two other young star forming regions in Orion A and B clouds: NGC 1977 and NGC 2024. Proplyds are found mostly in Orion in vicinity of O stars (ONC), but as low as B1V star (NGC 1977) providing diverse ranges of UV environments. In this talk, I will present recent work on properties of Trapezium cluster at the heart of Orion Nebula, and discovery of proplyds in NGC 1977 and NGC 2024. These clusters provide excellent laboratory to study interplay between UV radiation from massive stars and protplanetary disks in strong (ONC, NGC 2024) and intermediate (NGC 1977) UV radiation environments. NGC 2024 is unique as it provides the youngest age among the three regions (age <0.5-1 Myr), while NGC 1977 provides the weakest UV environment where proplyds are discovered. I will also present our kinematic studies of the proplyds and non-proplyd young stars in ONC and NGC 1977, and explore possible explanations for "proplyd life time problem".