Introduction
Reflect Orbital’s test satellite Eärendil‑1 is equipped with an 18‑square‑meter mirror capable of generating a five‑kilometre‑wide beam of sunlight on demand.
Threats to Ground‑Based Astronomy
The plan to launch up to 50,000 mirror‑satellites would dramatically increase night‑sky brightness. Roohi Dalal of the American Astronomical Society and Robert Massey of the Royal Astronomical Society argue that atmospheric scattering could make the sky three to four times brighter, erasing faint galaxy signals and hampering asteroid detection. Even if Reflect Orbital promises exclusion zones around observatories, the sheer number of reflective objects makes precise avoidance difficult. A yet‑unpublished study by Princeton researcher Gaspar Bakos suggests the illuminated footprint could exceed the 24 km² claimed by CEO Ben Nowack, widening the risk zone for major telescopes.
Human and Wildlife Eye‑Safety Risks
Reflect Orbital’s FCC filing admits that a 12‑inch (30 cm) amateur telescope pointed at the beam could cause permanent retinal damage. With roughly 100,000 amateur astronomers in the United States, that “small risk” becomes a public‑health issue. The bright flash could also blind drivers, pilots, or night‑time workers when the beam slews across the sky, a concern echoed by the Air Line Pilots Association. Historical parallels to Russia’s 1990s Znamya experiment highlight that looking at reflected sunlight is comparable to staring at the Sun during a total eclipse, a danger long warned by ophthalmologists.
Quick Q&A
Q: Will the mirrors affect Hubble images? A: Yes, bright streaks have already spoiled Hubble exposures. Q: Does the company have an automatic shut‑off? A: Reflect Orbital says it can dim or turn off the service, but trigger criteria are undisclosed. Q: Are dark‑sky groups opposed? A: DarkSky International calls the company’s response “cavalier” and urges stricter regulation. Q: Can the public know when the beam is active? A: No public schedule has been released, leaving observers unaware of danger periods.
Conclusion
For anyone who values clear night skies or protects their eyesight, monitoring Reflect Orbital’s announcements, supporting tighter FCC oversight, and using protective filters when observing are prudent steps. Experts recommend pausing large‑scale deployment until reliable safety mechanisms are demonstrated.