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“Studying the spectrum of a supernova over time is like taking a core sample. The calcium in our bones, for example, was cooked in a star. A star’s nuclear fusion is always forging heavier and heavier elements. At the beginning of the universe there was only hydrogen and helium … We can look deeper and deeper into the original star, sort of like an X-ray or a CAT scan.”

— Robert Kehoe, associate professor, physics

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