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Where Do Chemical Elements Come From? 1. What chemical element is the primary constituent of a young star? 2. Name the astrophysicist who first advanced the idea that the chemical elements originated from hydrogen in stars. 3. Name the stellar process in which the fusion of hydrogen produces other elements. 4. Why is iron the heaviest element that can be produced in stars? 5. What are the two opposing forces at work as fusion takes place in stars? 6. What name is given to the explosion of a star? 7. Neutron capture produces what kind of elements in a star? 8. Name the material sent into space by a supernova. 9. What does a spectroscope do to light?