NASA's Perseverance rover is the 1st spacecraft in years to carry fresh US plutonium. It won't be the last.
If you want to explore the outer solar system, you need plutonium. Deep inside some of NASA's most venerable space probes lie plutonium-filled hearts beating to warm and power the robots, which include the twin Voyager spacecraft, Cassini before its daring plunge through Saturn's rings and New Horizons trekking through the rubble of the Kuiper Belt.
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