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— Stellar nucleosynthesis is the process by which elements are created within stars by combining the protons and neutrons together from the nuclei of lighter elements.
All of the atoms in the universe began as hydrogen. ...
Heavier elements are created in different types of stars as they die or explode.
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Answer:
Stellar nucleosynthesis is the process by which elements are created within stars by combining the protons and neutrons together from the nuclei of lighter elements. A star formed in the early universe produces heavier elements by combining its lighter nuclei (hydrogen, helium, lithium, beryllium, and boron) which were found in the initial composition of the interstellar medium and hence the star.