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China
Europe
The United States
Japan
Satellites to stay in orbit
Signals to be transmitted between Earth and satellites
Rockets to be propelled forward
Rockets to be lighter
It is much quieter than other types of rockets
It is much smaller than other types of rockets
It does not have to carry very much fuel
The total weight of the rocket is greatly reduced as the rocket rises
Sputnik I
Explorer I
Vostok I
Freedom 7
Yuri Gagarin
Alan Shepard
Neil Armstrong
John Glenn
The Soviet effort to launch animals into space
The American effort to place humans in Earth orbit
The American effort to land astronauts on the moon
The Soviet effort to land humans on Mars
Small spacecraft that carries humans to space but can only be used one time
Spacecraft that carries scientific instruments that can collect data, but has no human crew
Large artificial satellite on which people can live and work for long periods
Spacecraft that can carry a crew into space, return to Earth, and then be reused for the same purpose
The Mir space station
The International Space Station
The largest multistage rocket ever built
A base on the surface of the moon
Visiting or passing near all the planets except Pluto
Exploring many moons, asteroids, and comets
Giving scientists tremendous new insights about the environments on different planets
All of these
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