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What are the two main types of rockets?
Rockets can either use solid or liquid fuel. Liquid fuel uses liquid-oxygen and fuel create a controlled explosion that can be regulated and turned off if necessary. Solid fuel rockets use a premixed solid fuel and oxidizer formula. Once it is ignited, it cannot be turned off, but is simpler, safer, and cheaper. There is no real difference in the job of the rocket engines, as both give thrust to the rocket.