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Scientists think that there has been life on the Earth for hundreds of millions of years.

However, we have not found life on any other planet yet.

The Earth is a planet and it goes around the Sun. Seven other planets also go around the Sun. None of them has an environment like that of the Earth, so scientists think there may be no life on them. The Sun and its planets are called the solar system (太阳系), and our solar system is a small part of a much larger group of stars and planets, called the Galaxy or the Milky Way. There are many, many stars in the Galaxy, and our Sun is only one of them.

Scientists have also discovered many other galaxies in the universe (宇宙). They are very

far away and their light has to travel for many years to reach us. So how large is the universe? It is impossible to imagine.

Scientists have sent spaceships to the planet Mars to take photos. They have even sent spaceships to travel outside the solar system. However, no spaceship has travelled far enough to reach other stars in our Galaxy.

Scientists have always asked the questions: with so many stars in the universe, are we alone, or is there life out there in space? Have there been visitors to the Earth from other planets? Why has no one communicated with us? We do not know the answers yet.

Planets in our solar system

There are1.planets going around the Sun in our solar system.

Life on the planet

No life has been found on other planets2.the Earth in the solar system because they have a3.environment from that on the Earth.

The solar system

It is a small part of the Galaxy and the4.is only one star in it.

Galaxies

Besides our galaxy, many other galaxies in the universe have been 5..But they are very far away from us and it6. many years for their light to reach us.

The universe

It is7.large to imagine.

Spaceships

Spaceships have been sent to take photos of the planet 8.and outside the solar system.But other stars in our Galaxy are so far that no spaceships can9.to them.

Questions

There are many questions about the universe and life in space,but no one can10.them yet.

Have you ever seen a person in the Moon? If you look closely at the Moon on some nights, you can see the face of a man in the Moon. Some people say that they can see an old man carrying sticks. Others see a girl reading a book. These pictures are made by the mountains and plains of the Moon.

Long ago people in England used to tell their children that the Moon was made of green cheese. Everyone knows that this is not true. The Moon is a large round rock. There is nothing on it. There are no trees or plants on the Moon. There are no rivers or seas. There are no living things. There is no air. It never rains on the Moon and everything is covered with dry, white dust. Not even a sound can be heard on the Moon.

The Moon is very hot when the Sun shines on it. But in the shade (背阴处) it is as cold as ice.

The Moon is much smaller than the Earth. It does not weigh as much as the Earth. If you went to the Moon, you would weigh six times less than you do now. Even a fat man would be able to jump high off the ground.

1.On some nights the Moon looks like______ .

A. an old man reading a book B. a star

C. mountains and plains D. the face of a man

2.The Moon is made of______ .

A. rivers and seas B. rock

C. dirt D. trees and plants

3.You can’t hear anything on the Moon because______ .

A. there are no living things on the Moon B. it never rains on the Moon

C. the Moon is a large round rock D. there is no air on the Moon

4.The Moon is______ .

A. very hot

B. very cold

C. sometimes very hot and sometimes very cold

D. covered with ice

5.On the Moon you could jump high in the air because______.

A. you would feel very happy

B. the Moon is very hot

C. the Moon is as cold as ice

D. you weigh six times less than on the Earth

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