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单词 gravity assist
释义

gravity assist


gravity assist

n. The use of the gravitational field of a moon, planet, or other moving celestial object to change a spacecraft's trajectory, especially to increase its velocity.

gravity assist


gravity assist

An astronautical technique whereby a spacecraft takes up a tiny fraction of the orbital energy of a planet that it is flying past, allowing it to change direction and speed. It has been used, for example, in the Voyager and Ulysses missions.
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