The night when there is no moon in the sky, you can see a faint band of cloudy light stretching right across the sky.This is the Milky Way from our earth, it seems a cloudy trail of stars. There are million of stars and a large amount of dust and gas particles in its spiral arms. It also includes our Solar System. There are 100 billion stars in the Milky Way.The light from these stars illuminate the galaxy. Our main stars, the Sun, is also in one of these arms. All the matter in the galaxy rotates around its centre. The centre of the galaxy contains older red and yellow stars. Its spiral arms contains hot, young, blue stars. The entire galaxy is rotating in the space. The Sun completes one lap of the galaxy about every 220 million years.
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