The cradle of a star is a cloud of hydrogen and dust. There are numerous such clouds in the universe. By the action of external forces-such as the explosion of a star-this cloud gets compressed and keeps pulling itself together due to the increasing force of attraction among the particles. After a few hundreds of thousands of years, it begins to shine. A proto-star, a star in the early stages, is formed. This keeps pulling itself together while rotating, and becomes hotter and hotter, till its interior reaches a temperature of around 10 million degrees Celsius. In the core of the star, the fusion of hydrogen into helium releases an enormous amount of energy. Now, the star becomes a main sequence star. It shines approximately for 10 billion years, till it 'dies'.
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