Earth is quietly dusted with thousands of tonnes of space material every year, most of it as grains smaller than sand — and some of it can be sifted from the grit of ordinary roof gutters, tiny meteorites hiding in plain sight in cities.

Extraterrestrial dust falls on every part of the Earth, including the parts covered in cities. Most of it arrives as grains a few hundredths to a few tenths of a millimetre across, finer than a grain of sand or close to it, and it lands without anyone noticing. Some of that material can, with effort, [...] The post Earth is quietly dusted with thousands of tonnes of space material every year, most of it as grains smaller than sand — and some of it can be sifted from the grit of ordinary roof gut