Nüwa is the first attempt of the Sustainable Offworld Network (SONet) to formulate a development model for a city that can sustain its own growth on Mars. A city and its population is a complex system with numerous cross dependencies. As a result, its design requires solutions based on high-level strategies rather than a compilation of specific technologies. We begin listing the high level basic functions that a city must satisfy and outline a basic development economic model. We then propose an urban solution based on a rock excavated city, and formulate its life support infrastructure as well as all the services and assets needed to keep it working. We then obtain a resource budget (material, energy and workload) by mapping Earth materials and processes to those more readily usable on Mars. As the wellbeing and the constant influx of inhabitants is a design requirement; social, economic and policies to facilitate the emergence of a Martian culture are also outlined. The main conclusion of this exercise is that our model seems feasible given forecasted developments in automation, but urge for full-scale Earth demonstrators. The design required contributions of academic and non-academic experts from across technical and social sciences. This highlights that developing concepts for a city beyond Earth is in full synergy with developing a more sustainable Earth-bound economy, and it has a great potential to initiate and inspire crucial conversations across society. Comments: 20 pages, 35 Figures, original submission to the Mars City State - Mars Society 2020 competition (minor typo fixed). Top 10 finalist over 175+. For additional media & attribution information contact us via SONet's website(http:\\www.sonet-hub.com). To appear in chap. 10 in book "Mars City States: New Societies for a New World", Ed. F. Crossman, The Mars Society, 2021(in press). This work is licensed under the Creative Commons Attribution 4.0 International License. To view a copy of this license, visit https://creativecommons.org/licenses/by/4.0/.
