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 are unmanned (e.g. Phoenix air-to-air missile). ("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 in relation to its weight on earth.
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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.