Making the Sun
The Universe is made up of countless clouds of gas and dust. Around 5 billion years ago. one of this swirling clouds formed a miiling - sized star - our Sun. The energy released by its burning gas provides the light and warmth necessary for life on Earth.

What makes the Sun shine?
Light from the Sun radiates through the entire Solar System. This light is generated in the core of the Sun, where temperatures reach around 15 million degree (27 million Fahrenheit), as hydrogen gas is converted into another gas, called helium, in a series of thermonuclear explosions, billion of times more powerful than the biggest nuclear bombs, are mere pinhead of these gases would be hot enough to ignite everything for 100 km (60 miles) around. The hot gases churn slowly towards the Sun's surface, where the burning solar gas shine for millions of miles into space.

STAR AND SUN

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