Thousands　of　confirmed　and　candidate　exoplanets　have　been　identified　in　recent　years.　Consequently,　theoretical　research　on　the　formation　and　dynamical　evolution　of　planetary　systems　has　seen　a　boost,　and　the　processes　of　planet-planet　scattering,　secular　evolution,　and　interaction　between　planets　and　gas/debris　disks　have　been　well-studied.　Almost　all　of　this　work　has　focused　on　the　formation　and　evolution　of　isolated　planetary　systems,　and　neglect　the　effect　of　external　influences,　such　as　the　gravitational　interaction　with　neighbouring　stars.　Most　stars,　however,　form　in　clustered　environments　that　either　quickly　disperse,　or　evolve　into　open　clusters.　Under　these　conditions,　young　planetary　systems　experience　frequent　close　encounters　with　other　stars,　at　least　during　the　first　106-107years,　which　affects　planets　orbiting　at　any　period　range,　as　well　as　their　debris　structures.　©　2016　SAIt.