If the Sun is a star, why is it so Big?

The Sun imaged by the Extreme Ultraviolet Imaging Telescope: NASA
The Sun imaged by the Extreme Ultraviolet Imaging Telescope: NASA

“Mummmmm”,”yes”. “I have a question”.  “Go on then, tell me about it”.  “Brian Cox says the sun is a star, why is it bigger than other stars?”  “Because it is” is not a viable option.

Before I started to look for an answer I became sidetracked reading about Professor Brian Cox.  One of his inspirer’s had been Carl Sagan.  So, I thought who is Carl Sagan.
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