11.   The planets were discovered by measuring their gravitational influence on the path of their stars.

v. + planet >>共 193
save 7.47%
find 3.74%
orbit 3.30%
have 3.08%
explore 3.08%
destroy 2.64%
circle 2.42%
discover 2.42%
detect 2.20%
protect 1.76%
discover + n. >>共 1625
body 8.20%
problem 2.02%
bomb 1.82%
remains 1.13%
truth 0.96%
case 0.94%
evidence 0.93%
drug 0.91%
error 0.88%
identity 0.79%
planet 0.19%
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