Scientists found cosmic dust on city rooftops for the first time. 500 grains of 4.6 billion-year-old cosmic dust were identified after filtering nearly 700 lbs of sludge from gutters in Oslo, Paris, and Berlin. We’ve known since the 1940s that cosmic dust constantly falls through the atmosphere, but no one has actually been able to locate it until now.
The roofs of Paris are cosmic dust collectors:
