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Found: Fossil Space Dust Hidden in the White Cliffs of Dover

Here’s a wonderful word to add to your vocabulary: Micrometeorites. Micrometeorites are teeny particles, less than a millimeter in size, that made it through Earth’s atmosphere from space. They are extraterrestrial, cosmic dust, star stuff—or, more precisely, asteroid stuff. As they speed through the atmosphere, micrometeorites melt to form spherical drops, and when they land on Earth, they cool and form dendritic crystals that branch from their surface like trees.
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