Space Mirror Startup Faces Scientific Opposition Over Nighttime Light Pollution

A California-based technology startup known as Reflect Orbital has received approval from the United States Federal Communications Commission to test a satellite equipped with an eighteen-metre-wide mirror. The project aims to reflect sunlight back onto Earth’s dark side, potentially providing illumination for streets or boosting solar farm output during nighttime hours. The company intends to launch its initial demonstration unit, named Eärendil-1, into low Earth orbit before the end of 2025 following a twenty-million-dollar funding round secured in May of that year.

The proposed technology involves opening a massive thin-film reflector once the satellite is operational. This device would redirect sunlight onto areas ranging between five and six kilometres wide on demand. The system claims to offer adjustable brightness levels comparable to those seen from a full moon up to full noon. If successful, Reflect Orbital plans to sell this reflected light to municipalities and corporations at rates of up to five thousand dollars per hour for use in lighting infrastructure or extending solar generation.

Despite the potential energy applications, the initiative has drawn significant criticism from the scientific community. Over 1,800 comments were submitted directly to the FCC regarding the project. Additionally, presidents of four international scientific societies representing approximately 2,500 researchers from more than thirty countries have written letters expressing their concerns. These groups are requesting a comprehensive environmental review and limits on satellite reflectivity and cumulative night sky brightness.

Scientists oppose the move due to fears that concentrated light beams could blind pilots and interfere with astronomical research. There is also concern regarding disruptions to circadian rhythms, which could negatively impact human sleep patterns and hormone release in both humans and animals. Furthermore, abnormal lighting conditions are believed to affect the migration of nocturnal species, seasonal cycles in plants, and the biological rhythms of marine phytoplankton that form the base of ocean food webs.

Roohi Dalal, director of public policy at the American Astronomical Society, stated clearly that the activities proposed by Reflect Orbital will impact the Earth environment. This includes effects on human health, agriculture, wildlife, and astronomy. Charalambos Kyriacou, president of the European Biological Rhythms Society, emphasised that plants require darkness to function properly and warned against removing it globally through artificial means.

Reflect Orbital’s co-founder and chief executive Ben Nowack acknowledged these concerns but argued that the pilot project would allow the firm to collect data. He aims to verify that installed safeguards can adequately control light beams. The FCC has maintained that space is not subject to the same environmental laws as Earth. Reflect Orbital has announced plans to launch a further 1,000 satellite mirrors by 2028 and up to 50,000 by 2035 if the pilot proves successful.

The final satellites could feature mirrors measuring up to fifty-five metres wide. The European Southern Observatory estimates that even a single sunbeam from such a system would appear around four times brighter than the full moon in the illuminated area. While environmentalists note concerns about rocket fuel emissions, others point out that light pollution is already detrimental to the environment and this technology could be extremely harmful if deployed without adequate safeguards.