On October 24, 2026, Sensors published the review "Additive Manufacturing of Lightweight Space Mirrors: A Review of Structural Design, Optical Fabrication, and Performance," systematically summarizing research progress in additive manufacturing for lightweight space mirrors. As space remote sensing moves toward larger apertures and higher resolution, optical systems impose stringent requirements on mirror specific stiffness and surface figure stability. The review covers design approaches such as topology optimization, lattice structures, and triply periodic minimal surfaces (TPMS), as well as the application of material systems including silicon carbide and aluminum alloys in mirror fabrication and optical processing techniques. Additive manufacturing can form hollow and honeycomb backside lightweight structures that are difficult to machine with conventional subtractive processes, making it an important technical route for reducing the weight of space optical payloads, with clear demand prospects amid the expansion of commercial remote sensing constellations. Value for powder buyers: (1) The metal mirror route is dominated by SLM of AlSi10Mg and 6061 aluminum alloy powders; volume growth in constellation remote sensing payloads will drive demand for highly spherical aluminum alloy powders. (2) Space optics place extremely high demands on powder batch consistency and internal porosity control, highlighting the scarcity of suppliers with aerospace-grade powder qualifications. (3) It is advisable to monitor how the competitive landscape between the silicon carbide route (ceramic, non-metallic) and the metal route affects the structure of powder demand.