| 释义 |
gravity assist
gravity assistn. 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.AcronymsSeeGA |