A million-satellite "mega-constellation" could permanently brighten the night sky by 300%, blinding our telescopes forever.
April 15, 2026
Original Paper
Large or bright satellite constellations: Effects on observations, including on the background sky brightness
arXiv · 2604.09427
The Takeaway
We used to think satellite pollution was just about annoying streaks in photos, but it’s actually much worse: we’re about to lose the dark sky itself. New research shows that proposed fleets of up to a million satellites would scatter so much sunlight that the background sky brightness could jump by 200-300%. This isn't just about seeing the stars with your eyes; it’s enough light pollution to make deep-space telescopes effectively useless. We are on the verge of creating a man-made "fog" around Earth that would hide the distant universe from us forever. If we don't change how we launch satellites, we might be the last generation to actually see the edge of the cosmos.
From the abstract
This study evaluates the effect of proposed constellations -- ranging from current deployments to mega-constellations and very bright reflector concepts -- on direct trail losses, diffuse background, and scattered sky brightness.We use a numerical model for Mie and Rayleigh scattering in the V band, adapted from moonlight sky-brightness calculations and validated against observations of moonlight and stellar background light. This is combined with the SatConAnalytic package to quantify scattered