Before revision: Plutonium-244 428x428px|A comparison of the relative fissiogenic xenon yields found in the meteorites Pasamonte and Kapoeta with those of a laboratory sample of plutonium-244.Plutonium-244 is one of several extinct radionuclides that preceded the formation of the Solar System.
After revision: 428x428px|A comparison of the relative fissiogenic xenon yields found in the meteorites Pasamonte and Kapoeta with those of a laboratory sample of plutonium-244.Plutonium-244 is one of several extinct radionuclides that preceded the formation of the Solar System.