Giant space mirrors Sunlight at night? Start-up wants to make it possible

A California-based startup has received approval from the U.S. Federal Communications Commission (FCC) to launch two demonstration satellites designed to reflect sunlight onto Earth’s surface during nighttime hours. The company, Reflect Orbital, aims to provide “sunlight on demand” through massive space mirrors, which could illuminate solar farms, rescue operations, construction sites, agricultural fields, military installations, and urban areas with beams of light up to five kilometers wide. The project has sparked both interest and skepticism among scientists and environmental groups. The FCC granted Reflect Orbital the license earlier this year for its initial test satellites, with plans to conduct trials later in 2026. If successful, the company intends to deploy more than 50,000 such mirrors into orbit by 2035. Each mirror would measure 18 meters by 18 meters and function as a reflective platform capable of redirecting sunlight to specific locations on Earth. According to the startup's website, these light beams would be adjustable in brightness and could shift their focus depending on the number of mirrors used. The system would require no ground infrastructure, offering a potentially flexible solution for lighting needs in remote or emergency situations. Reflect Orbital describes the technology as a means to enhance productivity and safety under low-light conditions. Potential applications include extending daylight hours for solar energy collection, aiding search-and-rescue teams operating at night, improving visibility on construction sites, and supporting agricultural activities. The company claims that the reflected sunlight would evenly illuminate targeted areas and could be activated or deactivated remotely. However, the American Astronomical Society (AAS) has expressed concerns over the feasibility and accuracy of the proposed system. The society argues that sunlight reflected from space would inevitably scatter in the atmosphere, making it difficult to achieve the precision claimed by Reflect Orbital. Additionally, the AAS questions whether the company’s models accurately predict how the light would behave once it reaches Earth. Beyond scientific doubts, there are broader ecological and safety concerns. Natural cycles of day and night have shaped life on Earth for millions of years, influencing everything from animal behavior to human circadian rhythms. Introducing artificial daylight could disrupt these patterns, particularly in sensitive ecosystems. There are also worries about potential hazards posed by sudden, concentrated beams of light affecting pilots, drivers, and other individuals exposed to them unexpectedly. Safety issues extend to the growing problem of space debris. Every additional satellite launched increases the risk of collisions in orbit, which can create dangerous fragments that threaten existing spacecraft and future missions. The FCC oversees satellite operations but does not regulate the potential impacts on the environment, wildlife, or human health. Any expansion beyond the initial two test satellites would need separate evaluation, according to regulatory guidelines. Reflect Orbital has not yet addressed these criticisms directly in public statements. The company emphasizes the benefits of its technology while acknowledging the need for further research and testing. It remains unclear how the startup will respond to the concerns raised by scientists and environmental advocates. As the project moves forward, the balance between technological innovation and ecological responsibility will likely remain a central point of discussion.