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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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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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New post 22 Dec 2018, 02:51
2. A. The paragraph mentions that the astronomers believe that the gas whirling around the center of a particular galaxy is because of the presence of black holes at the center. However, this is not the first reason for speculation.
B. This is the right answer. This is suggested in the lines 4-7. Hence, B is the answer.
C. The statement does not confirm what the proof is for. So we cannot be sure about this option or what the option mentions.
D. The movement of dust and gases suggest this. There is no considerable body of evidence suggesting the existence of black hole.
E. Astronomers are skeptical about the existence of black holes.
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New post 22 Dec 2018, 02:52
4. The last sentence of the first paragraph suggest that the concentration of mass In M87 is not necessarily a black hole; it might be a cluster of stars.
To undermine this statement, we need to prove that the concentration of mass in surely not a cluster of stars.
Answer choice B does it in the best way. Hence, B is the answer.
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New post 23 Dec 2018, 21:52
Skywalker18 wrote:

-The author talks about the black holes and how their existence is arrived at
-The author then discusses the objections of some skeptics to the existence of black holes
-The author eventually talks about how these skeptics could sometimes be wrong


Dear Experts workout Skywalker18 u1983
Could you please explain Question 4
4. 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 phenomeanon
(D)distinguishing among several different kinds of natural phenomena
(E)questioning a widely accepted explanation for an unusual phenomenon

I guess POE helps but I still can't 100% be sure how C is the primary purpose of the passage...
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New post 19 Jan 2019, 05:49
There are some requests to post an answer how to arrive at C so I will try.
I choose E in the beginning to be honest but in review I got to C following this thinking:

My strategy in these general purpose questions of reading comprehension is to be very literal with the Verbs and Adjectives of each answer statement:

A. explaining why a particular phenomenon is so rare

"Explaining" seems odd to me here on first sight as they text is opposing two different theories, so this word does not seem to be optimal choise. In addition there is no explaination of the text why the Black holes are rare -> OUT

B. criticizing a method used to gather data about a natural phenomenon

"Criticizing" makes more sense, because the text is actually presenting two possible explanations for the Black Holes and then argues for one these explanations. However it has nothing to do with gathering data -> OUT

C. considering possible instances of a particular phenomeanon

"Considering" seems okay. It refers to the fact that the text is reflecting multiple theories for the creation of ONE particular phenomena, the Black Holes, so we are fine here. Besides the first Verb it is also important to be literal with adjective here.

D. distinguishing among several different kinds of natural phenomena

"Distinguishing" seems also okay, but we only have one phomena and not different kinds -> OUT

E. questioning a widely accepted explanation for an unusual phenomenon

"Questioning" seems fine here. The next adjective is the "widely accepeted". Seems also okay as "most astronomers" believe that the large concentration of mass at the galaxy's center is a black hole whose gravity is causing the gas to whirl.
However the text never mentions that this phenomenon is unusual. We are assuming that because we migh have heard that black holes are not so common, but the text never explictly states that so -> OUT

Would be happy to get your opinion on this!
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Astronomers theorize that a black hole forms when a massive object   [#permalink] 19 Jan 2019, 05:49

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