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  Space: How old is our sun?
   
   
 
 
 
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30th Nov 2012, 3:53 AM
Can anyone tell me how old might be our sun? I heard many stories about how long it will live, but don't remember how old is it.

 
 
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1st Dec 2012, 1:57 AM
The Sun is abut 4.5 billion years old now. It is about 300 degrees hotter and about 6% greater in radius than when it was first born. It will continue to increase,in temperature, luminosity and radius at about the same rate for about another 5 billion years.

 
 
 
   
   
 
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