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The accepted model of planetary formation holds that Jupiter-sized planets could only form in orbits much farther from their parent star than Earth is from the Sun. Recently, astronomers have detected planets, though as large a Jupiter, have orbits around stars older than the Sun that are much closer to those stars than Earth's orbit is to the Sun. Nonetheless, most astronomers continue to regard the accepted model as correct.

第1题

Which of the following, if true, provides astronomers with the strongest for continuing to regard the accepted model of planetary formation as correct, despite the new discoveries?

A.The instruments used to detect planets orbiting other stars are incapable of detecting planets that are smaller than Jupiter.
B. Only a small fraction of the stars likely to have planets have been examined so far
C.After being formed, planets as small as Earth might be attracted to large planets, eventually becoming their satellites.
D.There is no known reason why older stars would tend to be more likely than younger stars to have planets
E.Planets tend to drawn into closer orbits of their parent star as time passes.

E显示答案

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