There is nothing more important to life than the sun. Without the sun all living things on the earth would die.
The sun is a star. In the sky there are thousands of stars like the sun. They are as large as the sun and as hot as the sun. At night you can see many stars, but in the daytime you can only see one star—the sun.
The sun is much nearer to us than any other star. That is why it looks the biggest and brightest of all the stars. The distance of the sun from the earth is as much as 150 million kilometres. Most of the stars are thousands of light years away from the earth.
Do you know the light years? Nothing in the world travels faster than light. It travels 300,000 kilometres a second. And one light year means the distance the light travels in one year.