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Plutonium-238 has a half-life of 88 years and emits alpha particles. It is a heat source in radioisotope thermoelectric generators, which are used to power some spacecraft.
of 12. Plutonium Glows in the Dark. Not all radioactive elements glow, but plutonium reacts with oxygen in the air causing it to glow a deep red, like a burning ember. Plutonium doesn't glow from the radiation it gives off, but because the metal essentially burns in air. It's called being pyrophoric.