Rocks left behind by fallen meteorites are some of the most fascinating (and valuable) space souvenirs on Earth. However, did you know there may be extraterrestrial space dust in your own backyard? Every year, these “micrometeorites” collect on nearly every square yard of Earth’s surface. In fact, according to a recent study, about 5,200 tons of space dust are deposited each year!
These microscopic space dust granules are less than a millimeter in size. Most likely originating from asteroids or comets, they flow through the atmosphere before being sprinkled upon Earth. These tiny particles have been found in desert sediments, marine clay, and in Arctic areas where the melting of ice facilitates easier extraction of the sample.
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https://www.studyfinds.org/space-dust-earth/
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