History of space travel

　　Time Events Information concerned

　　Early 1900s High-flying rockets

　　were built. It made the ancient dream of going to space possible to come (20) ________ .

　　1903 Konstantin Tsiolkovsky (21)________a way to use rockets for space travel. He planned to put correct scientific calculation to use in rocket science.

　　Around (22)

　　________ Robert Goddard built new rockets. The rockets could fly very (23)________in the sky.

　　During and after World War II German scientists

　　built large rockets that could travel very far and carry dangerous explosives. Germany was ahead of all the other countries in building space rockets and later it even offered (24)________ to the Soviet Union and the United States.

　　1961 The Soviet Union and the United States competed to get to space first. The Soviet Union became the (25)________ of the race when it launched the first satellite and sent the first astronaut into space.

　　1969 The United States (26)________in putting a person on the moon. In one way，it (27) ________the Soviet Union by becoming the first country to fly people to the moon.

　　1970s The Soviets built the first space station and was soon followed by Americans.And they finally ended the “space race” by (28)________．

　　Astronauts can live and work in space stations.

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