Lesson 54 Satellites

What was carried up into space on Oct. 15th, 2003?

Shen

Zhou

Ⅴ

Shen Zhou

Man-made A speed of…

Equipment Sun panels unfold

In a high circle Weather satellites

What is a satellite?

A satellite is an object, either natural or man-made, which travels in an orbit

round another object in space.

1.Why is it possible for satellites to go into space?

2. Why are satellites so expensive?

3. How does a satellite produce electricity?

4. What can satellites send back to the earth?

5.Why don’t most broadcasting satellites change their positions?

1. Why is it possible for satellites to go into space?

Because when the speed of a rocket that carries a satellite up into space reaches 28,440 km/h, it can

escape the pull of the earth.

2. Why are satellites so expensive?

Because it has to be light and it has expensive

equipment: cameras, etc.

3. How does a satellite

produce electricity?

A satellite produces electricity by using

very broad sun panels.

4. What can satellites send back to the earth?

Radio and TV programmes; signals; information and photos o

f weather conditions.

5. Why don’t most broadcasting satellites change their positions?

Because only in this way, they are

able to connect broadcasting

stations which are a long distance

from each other.

Note making

WHAT SATELLITES CAN DO

TYPES OF SATELLITES

TYPES OF SATELLITES

Broadcasting satellites

Weather satellites

Communications satellites

Space satellites

WHAT SATELLITES CAN DO

Make electricity

Take photos

Change direction

Receive and send signals

Collect and send information

Carry out experiments

Information on satellites and man-made satellites

Definition(定义）

Types

Natural satellites of the earth

An object, either natural or man-made, which travels in an orbit round another object in space, is called a satellite.

Natural satellites;Man-made satellites

The moon.It travels round the earth once every month.

Something about the man-made satellitesHow…carried up into space?

Speed to escape the pull of the earth

More information

Function(功能）

By rockets.

28,440 km/h

One of the most expensive pieces of scientific equipment.The lighter,the better. It contains very expensive cameras as well as equipment for making electricity from sunshine.

People can use man-made satellites to do lots of things.When rockets _________ satellites with expensive _________ up into space, people begin to use them for different purposes. For example, we can use them for _____________. In this way, we can receive radio and TV _________ from another part of the world. We can also use __________ satellites to tell not only _______ the weather is like _____ present, but also what is _______ to happen in the _______. In this way, we can ______ ships and planes of the possible weather.

carry/send

equipment

broadcastingprograms

weatherwhat

at likelyfuture warn

1.What was the name of the first satellite of the organization?

2. How many countries are there in this group today?

3. How can you telephone somebody on the other side of the world?

4. What was the use of special cameras?

5. What is the disadvantage of studying outer space at research stations on the earth?

It was called Early Bird.

There are now over 100 countries in this group.

With the help of a satellite you can telephone somebody on the other side of the world.

Special cameras can produce pictures showing where different metals can be found. And they can also tell the difference between healthy plants and plants that are diseased.

The disadvantage is that there is a lot of dust in the earth’s air, and the dusty air makes it difficult to get a clear picture of space.

Workbook P80 Ex.1

1.In 1964 a group of 17 countries set up an organization because ______________________________________.

2. Scientists are able to study outer space at their research stations on the earth with _________________.

3. The dog Sputnik 2 put into space died because ____________________________________.

4. The important information about areas of radiation around the earth was discovered by _________________ in _______.

5. Weather information was sent back to the earth by _______________ in _______.

6. The first weather pictures of the earth were taken in ______.

they wanted to send telephone signals by satellite.

space satellites

there was no way to bring it back to the earth.

the first US satellites 1958

a US satellite 1959

1960

The first satellite for telephones was sent up into space in August,1960. It measured 30 meters across. It was a simple satellite which we could not send out signals. Signals which were sent up from the earth hit the satellite and returned to the earth.