Short essay on sun . All about sun .
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Answer:
The Sun is the star in the center of our solar system. It is a yellow dwarf star. It gives off energy as light. That includes light, infra-red energy (heat), ultraviolet light and radio waves. It also gives off a stream of particles, which reaches Earth as "solar wind". The source of all this energy is nuclear fusion. Nuclear fusion is the reaction in the star which turns hydrogen into helium and makes huge amounts of energy.
The Sun is a star like many others in our Milky Way galaxy. It has existed for a little over 4.5 billion years. It is going to continue for at least as long. The Sun is about a hundred times as wide as the Earth. It has a mass of 1.9891×1030 kg. This is 333,000 times the mass of the Earth. The Earth can fit inside the Sun 1.3 million times.
Scientists think that the Sun started from a very large cloud of dust and small bits of ice about 4.567 billion years ago.[15]
At the center of that huge cloud, gravity caused the material to build up into a ball. Once this got big enough, the huge pressure inside started a fusion reaction. The energy this released caused that ball to heat and shine.
The energy radiated from the Sun pushed away the rest of the cloud from itself, and the planets formed from the rest of this cloud.