Massive space mirrors could be 40 times brighter than the full moon, astronomers warn. ‘It will be worse than big cities like London’
AI-summarised brief · reviewed before publication
A U.S. startup, Reflect Orbital, plans to launch 40,000 large sun‑reflecting mirrors into low Earth orbit. A study by Princeton astrophysicist Gaspar Bakos shows each mirror would appear 40 times brighter than the full moon, erasing stars for observers within a 3‑mile beam and brightening the sky beyond that distance. The company’s first satellite, EARENDIL‑1, will carry a 60‑by‑60‑foot mirror to test nighttime solar power and emergency illumination. The FCC’s approval has sparked backlash from astronomers, environmental groups, and aviation stakeholders concerned about widespread light pollution.
💡 Why It Matters
- · The mirrors could create a permanent twilight over large swaths of Earth, disrupting night‑time ecosystems and scientific observations.
- · Their deployment threatens to alter the night sky for future generations.