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Earth was formed over 4.5 billion years ago, but little physical material has survived from that early period. Today, the planet’s ancient secrets are locked away in rare geological relics, scattered across the globe like elusive time capsules. In the summer of 2024, research geologist Michael Ackerson and postdoctoral research fellow Wriju Chowdhury led an expedition to a remote rock formation known as the Acasta Gneiss in Canada’s Northwest Territories. Their goal was to collect more early Earth material for their own research and the Smithsonian’s National Rock and Ore Collection, where the samples would be available to scientists from around the world. Learn more from Mike and Wriju! GeoGallery: See some of the gems, minerals, rocks, and meteorites in our collection. https://naturalhistory.si.edu/explore...