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gravy ring
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gravity assist
grav·i·ty as·sist


noun 
Definition:
 
planet's gravity altering trajectory of spacecraft: the technique of utilizing a planet's gravitational field to alter the speed and trajectory of a spacecraft
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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