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Do you know the universe? When we talk
about it, we mean the earth, the sun, the moon and the stars, and the space1them. Many of the stars cannot be seen
because they are too far away.
The moon travels round the earth. It is
our satellite. It is quite near us in space. It is only 3, 800, 000 kilometers2, and it has been visited by
man already. So far, no man has traveled3than the moon, but spacships without
people have reached other parts of the universe. Man-made satellites have been
sent up into space by many countries. These satellites go4the earth and help us to learn more about
the earth and other things. Most countries use these satellites to send and
receive message. For example, with their help China can send5TV and radio programs to the other side of
the world. Foreign countries can send their programs to China. We can also use
satellites to help us make telephone calls to foreign countries.