学进去

The sun, the moon and the stars are all in the sky. We see the sun in the day. We see the moon and the stars at night. The sun is a ball. It is bigger than the moon. The sun has a family. It is the biggest in the family. The moon is a ball, too. It is much smaller than the sun. It is smaller than the stars. The light on the moon comes from the sun. The stars look smaller than the sun and the moon. But most of the stars are bigger than the sun. They are very far away from us, so they look small. All day the stars are in the sky. But the light from the sun is too bright. We cannot see the stars in the day.