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What Are Rare Earth Elements, and Why Are They Important for Space Exploration?
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What Are Rare Earth Elements, and Why Are They Important for Space Exploration?
Rare earth elements (REEs) are a group of 17 chemically similar metallic elements. This group consists of the fifteen lanthanides (lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, and lutetium), plus scandium and yttrium. Despite their name, most aren't actually that rare in Earth's crust. Cerium, for example, is more abundant than copper. The "rare"…
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