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Astronomer: In most cases in which a planet has been detected orbiti

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Astronomer: In most cases in which a planet has been detected orbiti  [#permalink]

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New post 10 Aug 2018, 04:14
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Astronomer: In most cases in which a planet has been detected orbiting a distant star, the planet's orbit is distinctly oval, whereas the orbits of Earth
and several other planets around our sun are approximately circular. However, many comets orbiting our sun have been thrown into oval orbits by close encounters with planets orbiting our sun. So some of the planets in oval orbits around distant stars were probably thrown into those orbits by close encounters with other planets orbiting the same stars.

Which one of the following, if true, would most strengthen the astronomer's argument?


(A)  When two planets or other large objects in orbit have a close encounter, usually the smaller of the two is the more greatly affected.

(B)  There is no indication that the orbit of any planet orbiting our sun has been affected by
a close encounter with another planet orbiting our sun.

(C)  In most cases in which planets have been discovered orbiting a distant star, more than one planet has been found orbiting the star.

(D)  Most comets with an oval orbit around our sun were thrown into that orbit by a close encounter with some other object.

(E)  For each distant star that has been found to have a planet, no other object large enough to affect the planet's orbit has been found orbiting the star

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Re: Astronomer: In most cases in which a planet has been detected orbiti  [#permalink]

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New post 10 Aug 2018, 05:16
(A) When two planets or other large objects in orbit have a close encounter, usually the smaller of the two is the more greatly affected.
affects them how? maybe vegetation on the planet changes? doesn't affect the conclusion

(B) There is no indication that the orbit of any planet orbiting our sun has been affected by a close encounter with another planet orbiting our sun.
weakener if anything

(C) In most cases in which planets have been discovered orbiting a distant star, more than one planet has been found orbiting the star.
so there are other planets around those observed. this might cause the planets to change their path. KEEP

(D) Most comets with an oval orbit around our sun were thrown into that orbit by a close encounter with some other object.
is that other object a planet? we don't know

(E) For each distant star that has been found to have a planet, no other object large enough to affect the planet's orbit has been found orbiting the star
weakener.

Answer: C
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Re: Astronomer: In most cases in which a planet has been detected orbiti  [#permalink]

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New post 10 Aug 2018, 06:24
D is not correct because it is already mentioned in the passage.To strengthen an argument the information should not be present in the argument.It needs to be outside.Am I correct..?
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Re: Astronomer: In most cases in which a planet has been detected orbiti   [#permalink] 10 Aug 2018, 06:24
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