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On July 9, 2026, the Federal Communications Commission granted a license to a small California company called Reflect Orbital to launch a satellite the size of a dining table, fold out an 18-meter sheet of mirrored Mylar 625 km above the ground, and aim a moving five-kilometer-wide spot of sunlight at whatever patch of Earth it wants to illuminate. The license covers a single satellite, Eärendil-1, and a single demonstration pass. The wider plan is as many as 50,000 such spacecraft by 2035.

The FCC’s order authorized radio spectrum for the spacecraft and the data link that will run the test. It did not authorize the act of bouncing sunlight at people, because that act is not a communications function and the agency does not regulate light. That distinction is the hinge on which the entire controversy swings, and it is why the American Astronomical Society called itself “dismayed” within hours of the announcement (The Debrief, July 16, 2026).

Astronomy is one of the few sciences whose primary signal is the absence of unwanted light. Ground-based optical telescopes depend on a sky that is, in their exposure windows, mostly dark. The Vera C. Rubin Observatory in Chile is currently running the largest astronomical survey ever attempted, stacking thousands of wide-field exposures from a 3.2-gigapixel camera over ten years. Every photon that does not come from a star, galaxy, or asteroid is a contaminant. Each Starlink train and imaging constellation has already cost the field time and money, and astronomers have spent the past five years learning how to subtract that signal from their data.

Eärendil-1 is a different kind of contaminant. It is not a point source streaking through a single exposure. It is a deliberate, modulated light source that the operator can point at any ground patch within range. Tony Tyson, the chief scientist of the Vera C. Rubin Observatory, told a National Academies meeting on June 4 that he considered the plan “even crazier” than the broadband constellations, because the thin-film reflectors would scatter sunlight rather than aim it precisely. “Imagine the sky full of moons,” he said (SpaceNews, July 10, 2026).

The European Southern Observatory, which operates some of the largest optical telescopes on Earth in Chile’s Atacama Desert, weighed in on July 1 with a calculation: a full 50,000-satellite Reflect Orbital constellation would multiply the background sky brightness at its facilities by a factor of three to four. Betty Kioko, an institutional affairs officer at the observatory, called the technology “an existential threat” to optical astronomy. Reflect Orbital’s FCC application drew nearly 1,900 public comments, almost all of them critical, before the agency ruled.

Reflect Orbital is based in Hawthorne, California, a few miles from SpaceX headquarters. The company calls itself “the sunlight company.” Its premise is that the Earth’s day-night terminator is, from a commercial standpoint, a wasted hour at the start of every morning and another at the end of every evening, and that an orbital mirror could redirect a small slice of sunlight onto a solar farm or work site during those hours. The chief executive, Ben Nowack, has said the satellites could extend the operating hours of terrestrial solar plants before sunrise and after sunset.

The FCC order, issued in the standard format used for experimental satellite licenses, gives the company permission to use the radio frequencies needed to control the spacecraft and telemeter its health data back to the ground. It does not, as the agency itself noted, authorize the optical payload. The 142-kilogram Eärendil-1 will carry a thin-film square reflector 18 meters on a side, made of aluminized Mylar, folded into the satellite’s body for launch and unfurled once the spacecraft reaches an altitude of 600 to 650 kilometers in a near-polar orbit inclined at 88 degrees. Reflect Orbital has said the satellite will ride to orbit on a SpaceX rideshare mission later in 2026.

The operational concept is to keep the reflector pointed at the Sun while continuously tilting its face so that the reflected beam sweeps across the dark side of the Earth below. A single satellite at 625 km can hold a five-kilometer-wide spot on the ground for several minutes at a time. With dozens or hundreds of satellites spaced around the orbit, the spot could be passed from one to the next and held for hours. The company has also said the light produced is “not bright enough to start fires or harm eyes, even when viewed through a telescope, and cannot be concentrated past maximum natural sunlight irradiance,” and that it will maintain exclusion zones around astronomical observatories and turn the beam off instantly on command.

The American Astronomical Society’s statement, released the same day as the FCC decision, was direct. It warned of damage to sensitive research instruments and flash-blinding risks to pilots and drivers, and noted that the company’s own FCC filings had included language about the possibility of permanent eye damage to anyone looking through a mid-sized telescope at the wrong moment. The society cited research suggesting that a full constellation could double or triple nighttime sky brightness even at remote observatories through atmospheric scattering of the reflected light.

The FCC’s response to those arguments was procedural. The agency’s order concluded that “concerns about Eärendil-1’s impacts on optical astronomy fall outside our review and authorization of the space station and are not a basis for denial of or additional conditions on Reflect Orbital’s operations.” It added that the company had committed to working with NASA and the National Science Foundation to address astronomical concerns. The agency framed its role narrowly: it regulates spectrum, not photons, and concluded that making spectrum available for new space activities serves the public interest.

A flat reflector in orbit cannot turn night into day, but it can shift the natural terminator. The Earth rotates once every 23 hours and 56 minutes, so any point on the equator spends roughly twelve hours in sunlight and twelve in darkness. A satellite in a sun-synchronous orbit at 625 km circles the planet about fifteen times a day, and on roughly half of those passes the spacecraft is on the lit side. The geometry that matters is the specular reflection angle: the mirror must be oriented so its normal vector bisects the angle between the incoming Sun and the outgoing ground spot, and that angle changes continuously as the satellite moves along its orbit.

The reflector itself is the simplest part. Aluminized Mylar at this scale has a mass per unit area of roughly 50 grams per square meter [unverified], so an 18-by-18-meter sheet weighs on the order of 16 kilograms. The hard engineering problems are attitude control and pointing stability. To hold a five-kilometer spot from 625 km up, the angle of the mirror must be controlled to within roughly 0.1 degrees [unverified]. Any vibration, thermal distortion, or gravitational sag in the unfurled sheet will smear the spot.

The scale of the proposed constellation is what worries astronomers most. Fifty thousand satellites at 625 km would put roughly one reflector every 100 kilometers along every orbit. Even with each satellite dark for half its orbit, the cumulative effect on the night sky would be a steady, moving pattern of bright objects that no terrestrial observatory could subtract out with software. The light is not radio interference, which can be filtered; it is broadband visible light in the same band the telescopes are trying to measure.

The FCC has approved a single test satellite, not a constellation. Reflect Orbital has until the end of 2026 to fly Eärendil-1, deploy its reflector, and demonstrate that the beam can be aimed precisely enough to stay inside the intended target zone. If the demonstration succeeds, the company will return to the FCC and likely to other agencies for the spectrum, orbital debris, and launch approvals needed for a full constellation. If it fails, the controversy loses its anchor. In the meantime, the American Astronomical Society, the European Southern Observatory, and the Vera C. Rubin Observatory argue that the test alone has already shifted the burden of proof, because the same engineering that lets one satellite hold a beam on a five-kilometer spot is the engineering that, multiplied by fifty thousand, lights up the night sky over the world’s best observatories.