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Stars die when they eventually use up all their fuel and burn out, but this process takes many millions of years.
Towards the end of its life, a star starts to run out of hydrogen to power its nuclear fusion. It starts to cool, becoming a red giant. The red giant swells, and the pressure at its centre becomes so great that the star begins to absorb energy instead of emitting it.
In a matter of seconds the star collapses, then explodes into a supernova. This is a huge explosion of light and en
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Tags: stars,
sun,
supernova
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