The Sun, a glowing globe of hot gas thousand of times bigger than the Earth, lies at the heart of our Solar System. Yet it is a pretty ordinary star. It is just one among 200 billion in our galaxy alone. Scientists estimate that it is about halfway through its life, having form, along with the Earth and the other planets, around 5 billion years ago. Although it is 1 392 000 km (865 000 miles) wide, it is middle weight in star terms and only medium brightness.
Why is the Sun Yellow?
The colour of a star depends on how it is and this, in turn, depends on its size and age. Our Sun is a star of medium size and brightness, with the surface temperature of about 5500 celsius (10 000 fahrenheit, whichmake it look yellow. As it gets older and uses up more of its energy, the surface temperature will drop to about 4000 celsius (7200 fahrenheit) and it will look red. When it has exhausted almost all of its energy, the Sun will collapse and heat up briefly in a white flare.
See how the Sun sattelite of distance (000 km) , radius (km) and mass (kg) at http://www.nineplanets.org/sol.html
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