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Use "gravity-assist" in a sentence
"Still, if there was something you really need to get rid of some isotope with no hope of beginning usable then using the VASIMAR to setup some gravity-assist with Venus and Mercury might help shed all that delta-V."
"Mission design team members say that directing MESSENGER along just the right path above Earth will mean smaller course-correction maneuvers on the way to the 2006 gravity-assist flyby at Venus - ultimately saving fuel for later in the mission."
"It used lunar gravity-assist to put it in orbit at the L2 point of the Sun-Earth system, 940,000 miles behind the Earth, with the Sun on the other side."