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What does GA stand for?

GA stands for Gravity Assist (spacecraft trajectories)

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We have 104 other meanings of GA in our Acronym Attic

Samples in periodicals archive:

In performing its first deep-space maneuver, the spacecraft initiated the first of two planned firings of its main engine to refine the spacecraft's trajectory, setting the stage for a gravity assist from a flyby of Earth Oct 9, 2013, that will send it on its way for arrival at Jupiter July 4, 2016, NASA Jet Propulsion Laboratory in Pasadena, Calif.
NASA engineers liken gravity assist to a person running next to a merry-go-round.