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Astronomers have long thought that the irregularity

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Astronomers have long thought that the irregularity [#permalink]

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New post 11 Jun 2017, 07:21
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Astronomers have long thought that the irregularity in the orbit of the planet Neptune was adequately explained by the gravitational pull exerted on Neptune by the planet Pluto. The most recent observations of Pluto, however, indicate that this planet is much too small to exert the amount of gravitational pull on Neptune that astronomers once thought it did.

If the statements above are true, they provide the most support for which one of the following?

(A) Neptune is somewhat larger than scientists once believed it to be.
(B) The orbit on Neptune is considerably more irregular than scientists once thought it was.
(C) There exists another, as yet undiscovered planet with an orbit beyond that of Pluto.
(D) The gravitational pull of Pluto is not the sole cause of Neptune’s irregular orbit.
(E) Further observations of Pluto will eventually show it to be even smaller than it is now thought to be.

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[Reveal] Spoiler: OA

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Last edited by broall on 14 Dec 2017, 07:50, edited 1 time in total.
Reformatted question

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Re: Astronomers have long thought that the irregularity [#permalink]

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New post 11 Jun 2017, 08:45
I disagree with the OA as Pluto turns out not to be any reason for Neptune's irregular orbit since the argument states "planet is much too small to exert the amount of gravitational pull on Neptune that astronomers once thought it did".
And the option d indicates that Pluto's pull is not the sole reason to cause the irregularity, but it is one.

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Re: Astronomers have long thought that the irregularity [#permalink]

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New post 11 Jun 2017, 21:21
Bhuvan.deshwal wrote:
I disagree with the OA as Pluto turns out not to be any reason for Neptune's irregular orbit since the argument states "planet is much too small to exert the amount of gravitational pull on Neptune that astronomers once thought it did".
And the option d indicates that Pluto's pull is not the sole reason to cause the irregularity, but it is one.


Let me try for this:
D.The gravitational pull of Pluto is not the sole
cause of Neptune’s irregular orbit.----it means other than pluto there are some forces that are contributing in the irregular orbit.

Argument says that planet(pluto) is much too small to exert the amount of
gravitational pull on Neptune...it does not say that pluto is not causing any gravitational pull..
Gpull = gravitational pull required for irregular orbit ..
Now GPLU = Gravitational pull by pluto ..a
according to argument,
GPULL > GLPU
to make equal ..
GPULL = unknown forces + GPLU .
What D says ..pluto is not the sole reason ........

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Re: Astronomers have long thought that the irregularity [#permalink]

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New post 12 Jun 2017, 23:59
Thanks sobby makes sense.

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Astronomers have long thought that the irregularity in the orbit [#permalink]

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New post 13 Dec 2017, 17:22
This topic have been merged with: http://gmatclub.com/forum/topic-255378.html

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Astronomers have long thought that the irregularity in the orbit   [#permalink] 13 Dec 2017, 17:22
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