Discuss the salient aspects of structure of Sun and the various activities going on in it. 

The Sun is a massive ball of hot, glowing gas, primarily composed of hydrogen (about 75%) and helium (about 24%), with trace amounts of other elements like oxygen, carbon, neon, and iron. Its immense size and energy output make it the central and most important star in our solar system. The structure of the Sun is divided into several distinct layers, each playing a crucial role in its function and energy production.

At the core, where nuclear fusion occurs, temperatures reach around 15 million degrees Celsius. This is the hottest part of the Sun, and it is here that hydrogen atoms undergo nuclear fusion to form helium, releasing an enormous amount of energy. This process generates the light and heat that the Sun radiates outward. The core is the source of the Sun’s energy, and its density and pressure _______ _________ ___ _______ _________ _________.
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