From the plutonium Wikipedia page, paraphrased: There's very limited quantities of it, and it is extremely expensive to manufacture. The U.S. government does give it out for research/scientific purposes but it is not too common. In the last decade only two space machines got it, one being Curiosity.
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From the plutonium Wikipedia page, paraphrased: There's very limited quantities of it, and it is extremely expensive to manufacture. The U.S. government does give it out for research/scientific purposes but it is not too common. In the last decade only two space machines got it, one being Curiosity.
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