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Average Stars<br />
Average stars spend most of<br />
their lives as boring, normal<br />
MAIN SEQUENCE stars.<br />
Our sun is a great example.<br />
It is about 4.5 billion years<br />
old.<br />
Average stars can live up to<br />
10 billion years before they<br />
begin to die out.<br />
IV.A.1.<br />
They create heat and energy<br />
through the process of nuclear<br />
fusion.<br />
IV.A.2.<br />
© 2004 Plano ISD, Plano, TX
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