Why do stars die

Stars are huge balls of burning gas that are scatted throughout the Universe. They burn for millions of years, giving off both light and heat. Stars die when they eventually use up all their fuel and burn out. This process may take millions of years. Towards the end of its life a star starts to run out of hydrogen to power its nuclear fushion. 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 absob 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 energy that can be seen right across the galaxy.

FACT FILE

In the night sky, all stars appear to be the same size. In fact, they are all different sizes. Some are much bigger than the Sun; others are much smaller than the Earth. The most common stars are the same size as the Sun.

resources: Tell me Why (Chancellor Press)
image 1: http://magazine.utoronto.ca/wp-content/uploads/2012/12/reddwarf_480.jpg
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