A rocket may be a missile, spacecraft, aircraft or other vehicle which is pushed by a rocket engine. Some rockets are manned (e.g. Saturn V). Other rockets, for example missiles, are unmanned. ("Manned" means that a person is in it; "unmanned" means that the machine can go without a person.) Most rockets can be launched from the ground because exhaust thrust from the engine is bigger than the weight of the vehicle on earth. Some rockets such as ion thrusters are too weak and heavy to lift themselves. Other rockets bring them to outer space where they can work.
Pioneers[change | edit source]
References[change | edit source]
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- Buchanan 2006, p. 2
- (Russian) "Юрий Алексеевич Гагарин". Astronaut.ru. 2007-07-11. http://www.astronaut.ru/as_rusia/vvs/text/gagarin.htm. Retrieved 2010-03-14.