Researchers from the Instituto de Energía Solar at Universidad Politécnica de Madrid reviewed flexible and lightweight photovoltaic arrays for space applications. The study examined specific power, stowage, and deployment characteristics across different mission environments. It surveyed the development of flexible solar cells, modules, and arrays used in planetary science missions and orbital services. The paper described fabrication approaches for high-specific-power arrays, including commercial products and emerging technologies. It discussed design challenges related to lightweight structures and electrical interconnections. The analysis assessed photovoltaic performance in orbital and interplanetary missions, noting trade-offs in power output and radiation resistance.