fig1

Figure 1. (A) Annual number of objects (CubeSat, satellite, etc.) launched into outer space^[10], reproduced under a Creative Commons license. (B) Increasing number of journal publications on PSCs and space-related PSCs, retrieved from the Web of Science on 15 September. (C) Number of journal publications for selected keyword combinations retrieved from the Web of Science on 15 September: PSCs + Radiation, PSCs + Lightweight, and PSCs + Thermal cycling.