It is now known that the elements observed in the Universe were created in either of two ways. Light elements (namely hydrogen, deuterium, helium, and lithium) were produced in the first few minutes of the Big Bang, while elements heavier than lithium are thought to have their origins in the interiors of stars which formed much later in the history of the universe. Figure 02-03e shows the sequence of nucleosynthesis during the first few hundred
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