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Transcriber: Amanda Chu Reviewer: Peter van de Ven It starts all the way back at the beginning of the universe 14 billion years ago, with the Big Bang and formation of everything when everything was just hydrogen and helium and a little some other stuff. But stars and galaxies began to form, and they were like factories for creating new elements. Really big stars formed and they exploded as supernovae, and this seeded the universe with everything heavier than iron that was born in these final moments of a supernova explosion. Now two of the things that were created in the supernova are what I want to talk about today: thorium and uranium. These were different because they were radioactive and they kept some of that energy from the supernova explosion stored in their very nuclear structure. And these materials along with all the others came together to form our solar system and our planet billions of years ago, and some of this thorium and uranium, then, was incorporated into our plane
