A rocket or rocket vehicle is a projectile, aircraft or other vehicle which obtains thrust by the effect to the expulsion of fast moving liquid from within a rocket engine. Chemical rockets operate due to hot fatigue gas made from "propellant" acting against the inside of incineration chambers and extension nozzles. This generates forces that both hasten the gas to extremely high speed, as well as, since every action has an equal and opposite reaction, generating a large plunge on the rocket.
The history of rockets goes back to at least the 13th century, possibly earlier. By the 20th century it included human spaceflight to the Moon, and in the 21st century rockets have enabled profitable space tourism.
Rockets are used for fireworks and an armaments, as launch vehicles for synthetic satellites, human spaceflight and study of other planets. While they are unproductive for low speed use, they are, compared to other momentum systems, very lightweight, extremely powerful and can achieve extremely high speeds.
Chemical rockets contain a large amount of energy in an easily liberated form, and can be very dangerous, although careful design, testing, manufacture and use can minimise the risks.
The history of rockets goes back to at least the 13th century, possibly earlier. By the 20th century it included human spaceflight to the Moon, and in the 21st century rockets have enabled profitable space tourism.
Rockets are used for fireworks and an armaments, as launch vehicles for synthetic satellites, human spaceflight and study of other planets. While they are unproductive for low speed use, they are, compared to other momentum systems, very lightweight, extremely powerful and can achieve extremely high speeds.
Chemical rockets contain a large amount of energy in an easily liberated form, and can be very dangerous, although careful design, testing, manufacture and use can minimise the risks.
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