Sun is a star in the centre of the solar system and is an important source of energy for life in earth.
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sun is a celestial body 
The Sun is the star at the center of the Solar System and is by far the most important source of energy for life on Earth
The sun lies at the heart of the solar system, where it is by far the largest object. It holds 99.8 percent of the solar system's mass and it is approximately 109 times the diameter of the Earth .
Sun :is a very important energy source of heat in our solar system