Pic: Sun The Sun is the star at the centre of our Solar System. The Earth and the other planets orbit the Sun, which makes up 99% of the Solar System's mass. Sunlight and heat from the Sun support all life on Earth. Without the Sun, there would be no life at all. What is the Sun? The Sun is an average star, just like countless others in the Universe. It was formed from a cloud of gas and dust, plus material thrown out by one or more exploding stars. Now, in middle age, the Sun burns yellow and quite steadily - giving the Earth daylight and fairly constant temperatures. Besides heat and light, the Sun sends out deadly gamma rays, X-rays and ultraviolet rays, as well as infrared and radio waves. How big is the Sun? The Sun is a small to medium sized star 1,392,000 km in diameter. It weighs just under 2000 trillion trillion tonnes. How old is the Sun? The Sun is a middle aged star. It probably formed about 4.6 billion years ago. It will probably burn for another 5 billion years and th
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