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Astronomers theorize that a black hole forms when a massive object

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Re: Astronomers theorize that a black hole forms when a massive object  [#permalink]

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New post 28 Nov 2018, 20:49
maheshaero20 wrote:
abhimahna wrote:
Keats wrote:
Adding another question to it from the official GMAT Prep software

The passage is primarily concerned with
A explaining why a particular phenomenon is so rare
B criticizing a method used to gather data about a natural phenomenon
C considering possible instances of a particular phenomenon
D distinguishing among several different kinds of natural phenomena
E questioning a widely accepted explanation for an unusual phenomenon


Please post the OA answer also for this question.

I am with C.



OA: C
can you please explain how you arrived at C.


Can anyone explain how to decide "C"?
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Re: Astronomers theorize that a black hole forms when a massive object  [#permalink]

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New post 29 Nov 2018, 00:33
3. Which of the following, if true, would most clearly undermine the possible explanation for the whirling gas in M87 that is mentioned in the last sentence of the first paragraph?


(B) A cluster of stars at the center would preclude the existence of certain other astronomical phenomena that have been observed at the center of M87.

(C) The stars within many existing galaxies, such as NGC 4258, are more closely spaced than are the stars within the core of M87.

Dear All

Anyone , please can you advice reasons for C over B. I was confused between these two and chose C, reasons that in the passage " If the center of NGC 4258 were a star cluster, the stars would be so closely spaced that collisions between individual stars would have long ago torn the cluster apart. ". I inferred from this sentence that the finding was of not a star cluster but something else, if not black hole.

I thought this undermines the explanation.

Please can anyone advice, happy to be advised if you believe my understanding of the passage is not correct, I did find the last sentence confusing.
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Re: Astronomers theorize that a black hole forms when a massive object  [#permalink]

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New post 30 Nov 2018, 23:03
proabhinav - hope this is helpful.

So this is a weakening question. 'if true' means we can use some imaginary situation, which may or may not true. before going for POE my pre-thoughts are --- I am looking for a choice, that weaken " the concentration in M87 might be a cluster of a billion or so dim stars.", In other words a choice that says that it is not true cause if this is true then some XYZ should also happen, but that is not. in general you want to look for existence of something you look for some evidence tto its presence. B is on these lines and I find it correct


(B) A cluster of stars at the center would preclude the existence of certain other astronomical phenomena that have been observed at the center of M87.

(C) The stars within many existing galaxies, such as NGC 4258, are more closely spaced than are the stars within the core of M87. ---- Why this choice is not correct? Are you sure that if something is true on other galaxy then its true here. May be presence of a huge gravitational force is stabilizing that galaxy. All I am saying is this choice is not providing enough info to conclude.
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Simple strategy:
“Once you’ve eliminated the impossible, whatever remains, however improbable, must be the truth.”

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Re: Astronomers theorize that a black hole forms when a massive object &nbs [#permalink] 30 Nov 2018, 23:03

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