Several private aerospace companies are planning the establishment of massive satellite networks aimed at data processing and energy generation in low Earth orbit. These initiatives could result in the Earth forming a glowing, artificial ring, as reported by Space.com. Astronomers are warning that such developments could have extreme implications for ground-based celestial observation.
The driving force behind this evolution is the significant energy and cooling requirements of modern data centers on Earth. The cold temperatures of space and the potential for uninterrupted solar energy availability make the cosmos an attractive venue. Companies such as Elon Musk’s SpaceX, Blue Origin from Washington State, and the California startup Reflect Orbital have submitted proposals for orbital infrastructures.
Orbital Data Centers on the Day-Night Border
To ensure consistent sunlight, these satellites and space mirrors must be positioned along a specific polar orbit, exactly following the so-called day-night border—the transition zone between the illuminated and unilluminated halves of the Earth. As all operators rely on this coveted pathway, the proposed satellites would cluster together and visually form a dense ring.
Hugh Lewis, a professor of astronautics at the University of Birmingham, indicated to Space.com that this concentration in the night sky would manifest as a visible band. He states, “The effects on the night sky would be absolutely catastrophic.” This artificial ring would overshadow all stars and planets during the evening and morning hours.
The Consequences of Light Pollution from Space Mirrors
Particularly concerning for the scientific community is the California-based company Reflect Orbital. The startup plans to launch 50,000 orbital mirrors designed to reflect sunlight onto terrestrial solar parks during the night. Samantha Lawler, an astronomer at the University of Regina in Canada, has visualized the effects of such configurations using computer simulations.
The simulations demonstrate that these reflective satellites would not only obscure visible stars but, in certain regions, could exceed their numbers. According to researcher calculations, the scattered light from this artificial ring could significantly brighten the sky for up to two hours after sunset. An older study from the European Southern Observatory already concluded that 50,000 such mirrors could increase night sky brightness by as much as 300 percent.
Critique of the American Federal Communications Commission
Despite the scientific concerns, the American Federal Communications Commission (FCC) has recently granted a license for a test satellite by Reflect Orbital. The agency stated that the effects on optical astronomy do not fall within their jurisdiction, a decision that has drawn sharp criticism from professional organizations.
The American Astronomical Society warns in an official statement about significant harm to astronomical research and potential dangers for aviation due to glare effects. While Reflect Orbital emphasizes relying on data for development and having independent third parties evaluate impacts, skepticism remains within the scientific community. “If we have mirrors in orbit, astronomy is over,” summarizes Samantha Lawler.
Outsourcing data centers into space may resolve earthly resource issues, such as massive water and land consumption by the IT industry. Still, these projects merely shift ecological and infrastructural burdens into near-Earth space. No global regulatory body currently exists to comprehensively evaluate issues of light pollution and the protection of the night sky alongside communication aspects.
