We know that there is air all around the world．We could not breathe without air．Airplanescoutd not fly without air．They need air to lift their wings．Airplanes cannot fly very high because asthey go higher the air gets thinner．If we go far enough away from the earth，we find there is no air. What is the sky?The sky is space．In this space there is nothing except the sun，the moon andall the stars．

　　Scientists have always wanted to know more about the other worlds in the space．They havelooked at them through telescopes and in this way they have found out a great deal．

　　The moon is about 384．000 kilometers away from the earth．An airplane cannot fly to the moonbut there is a thing that can fly even when there is no air．This is rocket．

　　I am sure that you are asking．How does a rocket fly?If you want to know，get a balloon andthen blow it up until it is quite big．Do not tie up the neck of the balloon．Let go!The balloon willfly off through the air very quickly．The air inside the balloon tries to get out．It rushes out through neck 0f the ballOOfl and this pushes the balloon through the air．It does not need wings like an air. plane．

　　This is how a rocket works．It is not made of rubber like a balloon，of course．It is made ofmetal．The metal must not be heavy but it must be very strong．There is gas inside the rocket whichis made very hot．When it rushes out of the end of the rocket，the rocket is pushed up into the air．

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