Reflect Orbital, a California startup, plans to launch a demonstration satellite in 2026 that will unfold a large mirror (about 60 by 60 feet) to direct sunlight to specific ground targets, initiating a broader goal of a constellation of roughly 4,000 solar reflectors to provide “light on demand” and extend daylight hours. The venture has secured funding and an SBIR award, and claims its demonstrations will be tightly localized to minimize impacts, with reflections covering roughly 5 square kilometers for limited periods. However, astronomers and biodiversity experts warn that such a system could dramatically increase light pollution, disrupt natural day–night cycles, affect wildlife (including insects and migratory birds), and complicate astronomical observations by creating bright, moving “artificial stars” in the night sky.
The proposal has sparked calls for environmental reviews, and space scientists emphasize the need to assess ecological and observational consequences before any large-scale deployment. Reflect Orbital states the project would tilt the mirror away after a reflection, and that demonstrations would produce a moonlike glow rather than continuous illumination. Critics caution that even localized lighting could have outsized effects if scaled to thousands of mirrors, and they urge careful consideration of the potential long-term impacts on ecosystems, human sleep health, and astronomical research. The company contends it intends to work with experts to understand sensitivities at each service site and to conduct environmental impact assessments ahead of broader deployment.
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