Star
A star is a hot, roughly spherical ball of gas that shines as a result of nuclear fusion reactions in its core. Stars are one of the fundamental objects in the universe. Stars—and indeed the entire universe—are made mostly of hydrogen, the simplest and lightest element. By contrast, our bodies are composed of many complex elements, such as carbon, nitrogen, calcium, and iron. These elements are created in the cores of stars, and the final act in the lives of many stars is a massive explosion that distributes the elements it has created into the galaxy. Eventually these elements may form another star, or a planet, or life on that planet.
Star birth
Stars are born in the...
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