When we talk about the universe, we mean not only the earth, the sun and the moon, but also the stars and space between them. There are millions of stars in our sky. The sun is one of them. Around it there are eight big planets moving, including the earth. The moon is our nearest neighbour in space. If you look at the sky on a clear night, it is possible to see about 3,000 stars. They look small, but they are really very big hot balls of burning(燃烧着的) gas. Some of them are huge, but others are much smaller like our planet Earth. The biggest stars are very bright, but they can only live for a short time. Every day new stars are born and old stars die.
All the stars are very far away. The light from the nearest star (except the sun) takes more than four years to reach the earth.
Hundreds of years ago, people used stars, like the North Star, to know which direction(方向) to travel in. Today you can still see that star.
【小题1】The universe means ________.| A．the earth | B．the sun, the moon and the stars |
| C．space between the stars | D．All of the above. |
| A．four years | B．1,000 days | C．100 years | D．four light years |
| A．when they were working | B．to tell them when to do farm work |
| C．while they were travelling | D．just for fun |
