How has the sun got heat ? and why doesnt it get spreadt in universe?
by 
matt kleviar
ANSWERS: 2
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Due to nuclear fusion.Here two hydrogen nuclie combine together to form a helium nucleus and trmendous amount of heat is liberated. It doesnt spread in the universe because its core,s gravity confines the huge ball of fire to a limited space and its gravitational pull keeps the planets revolving around it. If not clear you may put any no of comments till you are clear .It would be my plasure to talk on such a topic .
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The Sun generates heat through Nuclear Fusion. The Sun currently does this through fusing four hydrogen atoms into one helium atom. The reason heat is generated is because the start and end products do not weight the same (this amount is often termed the Mass Defect) and so to make up the total energy the new particle has to move faster and thus this generates heat. The reason it doesn't spread is because you need specific conditions for Fusion to occur. These are only present in the cores of Suns (and hydrogen bombs if you want to be picky). Outside Suns there isn't enough matter in the InterStellar Medium (the odd particles here and there in space) or high enough temperatures for this to occur. In our planet for example there isn't enough mass to compress the core significantly to generate fusion (though the core is believed to be Iron which is the last element you can form through Fusion and still get net energy out). If you have any further questions or want me to clarify bits let me know.
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