This fourth version of this School on Systems and Networks (SSN) presented a set of keynotes and lectures given by top researchers and practitioners, an academic conference, and a poster session. The talks were made in Spanish, articles were wrote in Spanish and they also included an abstract in English. The School was held in Universidad Austral, Valdivia, Chile, in October 29-31, 2018 and it covered various subjects related to Space Exploration, such as design of robust and resilient networks for spatial communication, delay tolerant networks, micro satellites, astronomic data analysis, and formal verification of aero-spatial systems. Travel and attendance grants were courtesy of ACM SIGCOMM, and NIC Labs. Conference management was courtesy of EasyChair.