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gravitational force
gravitational interaction
gravitational mass
gravitational theory
gravitationally
Gravitative
graviton
gravitons
Gravity
Gravity battery
gravity bomb
gravity fault
gravity gradient
gravity meter
Gravity railway
gravity wave
-- gravity-assist --
gravure
Gravy
gravy boat
gravy holder
gravy train
Gray
gray alder
Gray antimony
gray area
gray birch
Gray buck
gray catbird
Gray cobalt
gray code
Gray copper
Gray duck
gravity-assist
Noun
1.
gravity-assist
- (
spaceflight
)
a
trajectory
that
passes
close
to
a
planetary
body
in
order
to
gain
energy
from
its
gravitational
field
flight
,
space
travel
,
spacefaring
,
spaceflight
,
trajectory
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