Answers (2) |
meera
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Nov 29, 2006,9:16 am
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vk
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Nov 29, 2006,8:22 pm
Stars do not shine forever. That's because stars have limited amounts of nuclear fuel. Eventually they will exhaust their fuel - just like one tank of fuel lets you drive only a certain number of miles. When the fuel is exhausted, the car will stop. Likewise stars will stop shining when the fuel is used up.
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<br>Big stars have large amount of its nuclear fuel. but big stars also 'drink' more fuels. That's why they shine much brighter, using up their fuel very fast. Hence, the more massive stars have shorter lives.
<br>Big stars, those with masses 25 to 50 times that of the Sun - race through their lives in just a few million years. The Sun will last for about 10 billion years. Stars less massive than the Sun will last even longer. |
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