FCC Approves First Space Mirror Satellite for Launch
Reflect Orbital, a California-based startup, announced that its Earendil-1 satellite has received approval from the US Federal Communications Commission (FCC) for a scheduled launch in August 2026. The satellite, equipped with an 18-meter thin-film reflector, will conduct solar reflection tests in low Earth orbit to provide nighttime illumination to designated ground areas. Reflect Orbital claims the system can generate illumination of 0.8 to 2.3 lux within a 5-kilometer radius, significantly brighter than the 0.05 to 0.3 lux produced by a full moon.
Reflect Orbital plans to deploy up to 50,000 mirrors in low Earth orbit as a solution for nighttime lighting and clean energy. The company stated that the second-generation satellite was developed in half the time of the first, with performance upgrades already completed. Earendil-1 is not an off-the-shelf product but was designed in-house, including its structure, electronic systems, and integration and validation processes.
Reflected Light Intensity May Exceed Safety Limits, Experts Warn of Blindness Risk
Eric Bretschneider, an expert in optical engineering and LED lighting, highlighted that the intensity of light reflected from space mirrors poses a severe risk of eye damage. He emphasized that direct exposure to reflected sunlight is not a question of *if* harm will occur but *when*, given the inherent dangers of sunlight itself. Robert Massey, Deputy Executive Director of the British Royal Astronomical Society, further warned that amateur astronomers using telescopes could unknowingly suffer blindness from the satellite’s reflection, comparing the risk to directly viewing a solar eclipse.
Massey explained that the intensity of light reflected by space mirrors could exceed the safety limits of telescope filters, with even brief exposure potentially causing retinal burns. Bretschneider noted that the intensity of reflected light depends on the reflector’s angle and the ground reception area, adding that even at the edges of the illuminated zone, the light could still threaten human eyes. Currently, no independent studies have assessed the long-term effects of reflected light on human vision, nor has the potential disruption to night sky ecosystems or astronomical observations from large-scale deployment been clarified.
FCC Approval Raises Safety Concerns, Astronomy Community Worried About Observational Impact
The FCC’s approval of Earendil-1’s launch did not include a public explanation of how the agency evaluated the potential risks of reflected light to human eyes. While Reflect Orbital claims the technology could serve as an alternative to traditional nighttime lighting, experts remain skeptical about its safety and feasibility. Members of the astronomy community are concerned that large-scale deployment of reflective mirrors could interfere with astronomical observations and cause irreversible damage to the night sky environment.
Reflect Orbital stated that Earendil-1 will serve as a technology validation platform, with plans to achieve global nighttime illumination through a vast network of reflective mirrors. However, experts urge caution in advancing such projects without comprehensive safety assessments to avoid irreparable harm. While no specific organizations or individuals have publicly opposed the project, the astronomy community remains highly attentive to its potential risks.
