The United States has approved the experimental Eärendil-1 space mirror satellite, sparking worldwide debate over astronomy, light pollution, environmental impact, and the future of orbital technology.

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• The United States has authorized the launch of Eärendil-1, an experimental satellite equipped with a giant reflective mirror designed to redirect sunlight toward selected locations on Earth.
• Developed by California-based startup Reflect Orbital, the mission aims to test whether orbital mirrors can provide temporary illumination for specific regions during nighttime hours.
• The satellite will carry an approximately 18-meter reflective surface capable of directing sunlight for short periods, supporting research into innovative space-based lighting technologies.
• Reflect Orbital plans to deploy nearly 50,000 similar satellites by 2035, creating a large constellation intended to serve commercial, emergency response, agricultural, and infrastructure applications.
• Astronomers have expressed concern that artificial sunlight reflected from space could increase light pollution and interfere with telescope observations of distant stars and galaxies.
• Environmental experts warn that continuous nighttime illumination may disrupt wildlife, migratory species, ecosystems, and natural biological cycles that depend on darkness.
• Regulatory approval currently applies only to the demonstration satellite, while any future large-scale deployment will require additional technical reviews and regulatory clearances.
• The approval has intensified global discussions about balancing technological innovation with scientific research, environmental protection, and the responsible use of Earth’s orbital environment.