Space Mirrors Could Harm Astronomy and Human Vision

Solar‑to‑Earth reflection has long been a speculative dream, but the idea is moving from theory to test flight. The concept—placing a large mirror in orbit and angling it to beam sunlight onto a chosen region—has been explored for more than a century, with Russian scientists testing the notion in the 1990s under the Znamya project. The goal is to provide continuous illumination or generate power by redirecting solar energy that would otherwise miss the planet.

California‑based Reflect Orbital is now attempting to revive the concept. The company plans to launch a small prototype satellite, Eärendil‑1, as a proof‑of‑concept platform. If successful, the firm intends to build a fleet of up to 50,000 such mirrors, each capable of targeting specific geographic areas for day‑long solar illumination or power generation. The project represents a significant step toward a practical space‑based solar‑mirroring system that could complement terrestrial renewable energy sources.

Should the test satellite perform as expected, Reflect Orbital would have demonstrated the feasibility of orbital solar reflectors, opening the door to a new generation of renewable energy infrastructure that operates beyond Earth’s atmosphere. The company’s next steps will involve scaling the technology, refining deployment mechanisms, and addressing regulatory and safety concerns associated with large orbital mirrors.