1) The system includes the , the and eight other .

2) The Sun is actually a . It looks very big because it is the star to Earth.

3) The Sun gives out and on its own. It is made up of very hot .

4) Planets do not give out . We can see them because they light from the .

5) The planets moves round the Sun along a path called an .

6) If the Earth were much to the Sun, it would receive too heat energy and the would drastically. The oceans would dry up and most things would die because of the heat.

7) If the were farther from the , it would receive too little from the Sun and the temperature would fall. The would freeze and most living things would not be able to in the cold weather.

8) The is a layer of surrounding the Earth.

9) The composition of air around the Earth are nitrogen, , , water vapour and other gases.

10) The atmosphere is important to us because the oxygen in the atmosphere is used for and the carbon dioxide is used for . The carbon dioxide helps to retain some heat from the Sun.

11) The Earth on its own axis from to .

12) It takes about hours or day for the Earth to complete one . At any one time, one side of the Earth will be facing the Sun.

13) The and cycle is caused by the rotation of the around the .

14) The Earth round the Sun in its orbit. It takes about year for the Earth to complete one round the Sun.

15) A is an object that round another larger object in space.

16) are natural satellites of the Sun. The is a natural satellite of the Earth.

17) The is not a star. It about its own axis and it round the Earth. It takes days for the Moon to one revolution round the Earth. This causes the of the Moon which are the changes in the shape of the Moon..

17) There are man-made moving aroud the Earth.

18) satellites sends telephone messages and broadcasts television programmes from one part of the Earth to another.

19) satellites make of the Earth and records the weather . Meterologists uses the data to help them make weather .

20) satellites information about objects in space.

21) satellites helps ships and aeroplanes locate their positions.

Test yourself
Are you able to state the composition of the Solar System?
Are you able to state some characteristics of the Sun, the Moon, the Earth and the planets.
Do you know why the Earth is able to support life?
Do you know the effect of the regular movement of the Earth and the Moon?
Are you able to state some uses of man-made satellites?