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why do we classify the sun as a star?

The sun undergoes nuclear fusion within its core, which is something stars do and planets don't do. Not only is the sun a star, but it's actually the closest star to Earth and vital for life here. Our sun appears to be yellow from our viewpoint here on Earth, but it is actually white!


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In the 1800s a technique called spectroscopy was used to analyse the Sun. When light is slipt into the full spectrum of colours, dark bands can be seen which correspond to chemical elements. It's like a signature. When the same technique was used to analyse the light from stars, the same patterns of lines appeared. In other words, the Sun and the stars were made of the same stuff. We only think of the Sun as different because we are so much closer to it.

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BECAUSE THEY EMIT THEIR OWN LIGHT .THEY MOSTLY CONSITS HYDROGEN GAS.THE HEAT AND LIGHT OF BOTH ARE PRODUCED BY THE NUCLEAR FUSION,REACTIONS TAKING PLACE INSIDE THEM ALL THE TIME.

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We called sun as star bcoz it has it own light and energy.

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yes

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Because it emmits light of its own
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because stars have it own light .

 
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That's because 1)sun emits light of its own 2)It undergoes nuclear fission and fusion both 3)Hydrogen atoms break to form helium atoms,and this reaction emits a huge ,very huge indeed,amount of heat and light which we get on earth. 4)It is very large in size 5)Many planets and planetoids revolve around it . That's enough for even a 5 mark question,i think! Hope it helps
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we call sun as a star because it emits its own light.
 
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Due to nuclear fission and fusion both.
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Because they emit their own light and heat
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We can say that our sun is a star because it  has some nuclear reaction which makes it shine . Yes, it does not burns because burning needs oxygen and in space ....... well it is......molecules. 
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