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Liquid-powered rocket engines have several advantages. Liquid rocket engines have higher specific impulses (Meaning they produce a high amount of thrust for a small amount of fuel) which makes them more efficient. Liquid-powered engines can be throttled in real-time, and have a good control of mixture ratio. They can be shut down and restarted at any time. Liquid rocket engines can be tested before use to ensure that they will operate properly. Liquid engines, such as the Space Shuttle Main Engines (SSMEs), can also be re-used.

Because of these safety and performance advantages, liquid engines are commonly used for manned spaceflight. Rocketry pioneer Wernher von Braun even went as far as saying that liquid-fueled engines were the only engines safe to use on manned spacecraft.

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