Official 26 Lec 3
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Question 6 of 6
According to the professor, what can change a parabolic-orbit into a periodic-orbit comet?

A.

The loss of some of the comet's material

B.

The force of escaping gases

C.

The gravitational influence of a planet

D.

Energy from the Sun

我的答案:

正确答案:C

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