21.   The same gravitational effects can also cause a comet to swing out of the solar system altogether and start an endless journey into deep space.

a. + effect >>共 805
long-term 3.00%
negative 2.93%
immediate 2.88%
adverse 2.65%
positive 2.46%
same 2.34%
ill 2.11%
overall 1.57%
opposite 1.49%
possible 1.49%
gravitational 0.16%
gravitational + n. >>共 66
pull 25.87%
force 15.38%
field 10.84%
effect 7.34%
influence 4.90%
attraction 4.90%
tug 3.15%
lens 1.75%
slingshot 1.05%
perturbation 1.05%
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