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What is a star?

A star is a massive, luminous celestial object composed mostly of hydrogen and helium undergoing nuclear fusion. The process of nuclear fusion occurs in the star's core, where intense heat and pressure cause hydrogen atoms to fuse together to form helium, releasing a tremendous amount of energy in the process. This energy is emitted as light and heat, making the star shine.


Stars come in various sizes, temperatures, and colors, and they play a crucial role in the universe by influencing the formation of galaxies, planets, and other celestial bodies. The Sun, for example, is a type of star known as a G-type main-sequence star, and it is the closest star to Earth, providing the energy necessary for life on our planet. Stars can also go through different stages in their lifecycle, ultimately leading to their evolution into different types of objects, such as white dwarfs, neutron stars, or even black holes, depending on their mass.

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