Blurry streaks of light created by fast-moving artificial satellites are already known to mar images taken by ground-based observatories. Today, researchers report in Nature that space-based telescopes will not escape such interference as fleets of private satellites proliferate. The researchers found that in the next decade, satellite trails could taint roughly 96% of the images taken by some space-based telescopes, and a single image could contain as many as 92 streaks.