- NASA's inventory of plutonium-238, which is essential for building long-lasting batteries, is running out fast, and restarting domestic production is unlikely. The United States stopped producing plutonium-238 in 1988, and since then has relied upon a dwindling stockpile supplemented by Russia. https://www.space.com/5054-plutonium-shortage-thwart-future-nasa-missions-outer-planets.html 3 comments space
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