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In the late 1950s, astronomer Margaret Burbidge helped unravel one of nature’s deepest secrets: how stars manufacture the elements themselves. Through nuclear fusion, stars transform simple hydrogen into helium and, in their later stages, into carbon, oxygen, and the heavier elements that make planets—and life—possible. A star’s fate is written in its mass. Low-mass stars like the Sun swell into red giants before shedding their outer layers and fading as white dwarfs. Massive stars live fast and die young, forging ever heavier elements in layered cores until iron halts fusion altogether. Gravity then wins. The star collapses, rebounds, and explodes as a supernova, scattering the raw materials of worlds across space. What remains is an ultra-dense stellar corpse—a neutron star or pulsar—so compact it warps spacetime itself and beams radiation across the cosmos. At the heart of this story lies one of the most important discoveries in modern physics: the neutron. In 1932, James Chadwick confirmed the existence of this electrically neutral particle, resolving deep mysteries about atomic structure and stellar processes alike. Neutrons made it possible to understand how elements form in stars—and also how nuclei could be split on Earth. Within a decade, this same insight led to nuclear fission, chain reactions, and ultimately the atomic bomb. The same physics that lights the stars was turned into a force capable of ending civilization. This chapter traces a profound arc: from the interiors of stars to the laboratories of physicists, from cosmic creation to existential risk—revealing how humanity’s understanding of the universe forever altered both our knowledge and our destiny.