gravity assist
短语发音
/ˈɡɹævɪti əˈsɪst/
词形变化
gravity assists
复数
别名
gravitational assist
gravity-assist
释义与例句
n.
-
1.
The favorable alteration of the speed and trajectory of a spacecraft as a result of its passing near to a celestial body.
天文MESSENGER successfully flew by Mercury yesterday, gaining a critical gravity assist that will enable it to enter orbit about Mercury in 2011.