A California startup is preparing an ambitious orbital test: a steerable mirror designed to redirect sunlight onto specific areas of Earth after dark. On July 9, the U.S. Federal Communications Commission authorized Reflect Orbital to launch Eärendil-1, a prototype satellite with a reflective film about 18 meters wide.
The concept is simple in principle and bold in execution. As the satellite moves above Earth's night side, it would catch sunlight and project a bright patch onto a chosen location below. Reflect Orbital says the illuminated area could span several kilometers, opening the door to new uses in solar energy, agriculture, emergency response, and remote operations.
A test for "sunlight on demand"
The spacecraft is planned to orbit roughly 625 kilometers above Earth and use a motorized thin-film reflector to aim light with precision. The company envisions a future network of satellites that could offer adjustable brightness, from moonlike glow to near-daylight levels, depending on demand.
Reflect Orbital's roadmap points to two satellites in 2026, then a much larger expansion later in the decade. If successful, the system could support longer growing cycles, help power solar farms beyond sunset, and provide temporary lighting for construction or rescue missions in hard-to-reach places.
Why astronomers are watching closely
The idea has also drawn attention from the astronomy community. Researchers note that a large fleet of reflective satellites could create bright moving objects in the sky and interfere with telescope observations. A modeling study from the European Southern Observatory suggested that a very large constellation could significantly increase sky brightness and disrupt wide-field imaging.
For now, the FCC's approval applies only to this single experimental spacecraft. Any broader constellation would require separate review and authorization. The company says the system will stay off by default and operate only with local approval.
Space mirrors are not entirely new. Earlier experiments, including Russia's Znamya 2 in the 1990s, showed that reflecting sunlight from orbit is technically possible. What is changing now is the scale, precision, and commercial ambition behind the idea. If the prototype performs as planned, it could mark a new chapter in how orbital technology supports life on Earth.
In the years ahead, this kind of innovation could reshape how cities, farms, and energy systems think about time, light, and productivity.