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Have you wondered … what is a star? In short, mostly a giant ball of hot gas. Stars shine due to a process called nuclear fusion. This process occurs when the cores of atoms are squeezed together so tightly that new, heavier elements form. It's only possible due to the extremely high temperatures and pressures in the star’s core. We're quite familiar with our star, the Sun, but there are lots of other types of stars out there with different sizes, masses, ages, temperatures, and levels of bright
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