NEW YORK, July 14 — 10 full moons. That is the illumination level the new mirror satellite will cast onto Earth’s twilight sky, and it has environmental and astronomical groups pushing back hard. The bottom line: A private company’s orbital reflector, approved by the Federal Communications Commission, will shine light equivalent to ten full moons during dusk and dawn operations.
The International Dark-Sky Association, founded in 1988, says the project threatens ecosystems, human health, and ground-based astronomy. By the numbers, the satellite’s brightness is the figure that matters.
Ten full moons of artificial light during twilight hours will affect nocturnal wildlife in ways scientists are still measuring. Studies cited by the IDA show that light pollution disrupts migratory birds, sea turtles, and insects — creatures that rely on natural darkness for navigation, reproduction, and survival. The FCC approval comes with strings attached.
The satellite must avoid reflecting light onto populated areas between 10 p.m. and 6 a.m. local time. Reflect Orbital, the company behind the project, has agreed to limit operations strictly to twilight hours — dusk and dawn — to minimize the impact on nighttime darkness.
Astronomical concerns
Ground-based telescopes will feel the effects. The Mauna Kea Observatory in Hawaii, one of the world’s premier astronomical research sites, could see interference from the satellite’s light. The company’s orbit will avoid areas with high astronomical research activity, such as the Atacama Desert in Chile, but that leaves other observatories potentially exposed.
Investors will note that the company has agreed to provide data on light levels to the IDA for ongoing monitoring. That transparency measure was part of the conditions attached to the FCC approval, though critics argue it does not address the fundamental problem of adding artificial light to the night sky.
The IDA has been tracking light pollution since its founding in 1988. The organization’s position is clear: artificial night lighting disrupts ecosystems and human health, and adding a space-based reflector only compounds an existing problem. The studies they cite cover a range of species and habitats, all pointing to the same conclusion — darkness matters.
What to watch next
The satellite’s operational limits are the key variable. Twilight hours are a narrow window, but ten full moons of light during that period could still have measurable effects on wildlife behavior and astronomical observations. The data the company provides to the IDA will be the first real test of whether those limits are sufficient.
Reflect Orbital’s compliance with the FCC conditions will determine whether the project expands or faces additional restrictions. For now, the satellite will operate in a carefully defined box — avoiding populated areas at night, staying within twilight hours, and steering clear of the Atacama Desert and other research zones.
The figure that matters going forward: how much actual light reaches the ground, and what the IDA’s monitoring data shows. That will tell investors, astronomers, and environmental groups whether ten full moons of artificial twilight is a manageable compromise or a step too far.
