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The energy that radiates from a star originates in the nuclear fusion process going

on in its core. That process continues as long as there is hydrogen remaining to be

fused. When the star runs out of hydrogen, its energy output changes, and eventually

diminishes to a trickle.

In the case of our Sun, it's estimated that perhaps half of the Sun's hydrogen has

been fused, meaning that the Sun is perhaps halfway through its lifetime, and may

change drastically in only another 4.5 billion years.

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