In recent years, a wave of private companies has begun transforming space from a domain once dominated by government agencies into a bustling commercial frontier. This shift brings exciting possibilities but also raises significant concerns among scientists, environmentalists, and policymakers. One of the most striking examples of this new space enterprise is Reflect Orbital, a California-based startup planning to deploy thousands of giant mirrors in Earth’s orbit to beam sunlight down to the surface during nighttime hours, effectively providing “sunlight on demand.” While the company markets this innovation as a way to power solar farms after dark and brighten public events, experts warn of the technological challenges and potential negative impacts on astronomy, the environment, and space safety.
Reflect Orbital’s ambitious project involves launching a test satellite called EARENDIL-1 in 2026, named after a character from J.R.R. Tolkien’s Middle-earth mythology. Once in orbit approximately 600 kilometers above Earth, the satellite will deploy an 18-by-18-meter mirror—about twice the size of a volleyball court—to reflect sunlight onto targeted areas on the ground. The company envisions a future constellation of up to 4,000 such satellites by 2030, each capable of casting a beam roughly 5 kilometers wide and four times as bright as the full moon. This would create a continuous chain of illumination, with one satellite transferring the sunbeam to the next as they orbit overhead, extending the period of artificial daylight after sunset and before sunrise.
Reflect Orbital’s backers include prominent investors such as Sequoia Capital and billionaire Baiju Bhatt, along with support from a $1.25-million Small Business Innovation Research contract from the U.S. Air Force. They tout the project as a potential boon for renewable energy, enabling solar power generation even during nighttime hours, and as a novel way to enhance urban and entertainment spaces by brightening outdoor environments with natural-looking sunlight. The company has also pledged to protect dark skies by steering light beams away from observatories and sensitive areas.
However, the technical hurdles to achieving this vision are formidable. Experts like Darren McKnight, a systems engineer at LeoLabs—a company specializing in tracking space debris—point out that while individual components of the project may be feasible, integrating them into a reliable, large-scale system is far from straightforward. The mirrors and satellites would face issues like overheating due to constant sun exposure and the need for precise station-keeping to maintain accurate beam targeting. Additionally, atmospheric conditions such as clouds, rain, or dust could scatter or diminish the reflected light before it reaches the Earth’s surface, reducing effectiveness and complicating operations.
The concept of space-based mirrors is not new. In the 1990s, Russian scientists experimented with similar technologies but ultimately abandoned the effort, likely due to the same technical and logistical complexities. Today, Reflect Orbital’s plan to populate low-Earth orbit with thousands of these large mirrors raises fresh concerns, especially given the already crowded and increasingly contested orbital environment.
Astronomers have been among the most vocal critics of Reflect Orbital and similar initiatives. On October 6, a coalition of astronomers released a fact sheet condemning the project as a reckless use of Earth’s finite orbital resources. They emphasized that many of the problems sunlight-on-demand aims to solve—such as extending solar power availability—already have terrestrial solutions and that adding bright, moving light sources in the night sky could severely disrupt scientific observations. John Barentine, an astronomer and executive officer of Dark Sky Consulting, warns that even satellites not directly in the beam’s path would appear among the brightest objects in the night sky, exacerbating the problem of light pollution.
This concern extends beyond just Reflect Orbital. SpaceX’s Starlink constellation, now comprising more than 8,000 internet satellites, is already notorious among astronomers for “photobombing” telescope images with bright satellite streaks. Other ventures, like Amazon’s Project Kuiper and AST SpaceMobile’s BlueBird satellites, similarly contribute to the growing population of bright objects in low-Earth orbit. Some of these satellites have been shown to be exceptionally bright and disruptive, complicating efforts to study the cosmos from the ground.
Reflect Orbital’s project also highlights a broader trend of increasingly unconventional and sometimes controversial uses of space. Jordan Bimm, a space historian at the University of Chicago, notes that while humans have long sent quirky items into orbit—such as astronauts bringing corned beef sandwiches on Gemini III in 1965 or a gorilla