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23 May 2020, 11:17
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omersoylu
Hi Omer
Let me try to address your query. Let us first consider option (B).
(B) criticizing a method used to gather data about a natural phenomenon
The verb "criticize" only applies to the second paragraph. The first paragraph does not have any criticism or even supporting context for any criticisms in the passage. "Method" in this context should refer to a scientific process or steps which are taken to achieve a particular aim. The passage does not consider any such method. Finally, the passage does not address "data gathering" in any part or form. Overall, I would say this option does not describe the primary purpose of this passage.
(C) considering possible instances of a particular phenomenon
The word "consider" applies to both paragraphs since the passage does consider two "possible instances" of a black hole. In both the galaxies mentioned, the "possibility" of there being a black hole at the centre is not convincingly ruled out, and the passage does try to weigh the evidence in favour of and against.
Hope this helps.
04 Aug 2020, 10:47
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Question premise: what most clearly undermines the explanation for the whirling gas being a cluster of dim stars? --> So I was looking for answers that would show the whirling gas couldn't be stars or could only be something else other than stars.
I also chose C incorrectly, since I inferred that if the stars were more closely spaced than others that meant that the whirling gas must have been from a black hole. I didn't understand some of the other explanations from other users on why this was incorrect and instead B was correct, so I looked up the word "preclude" and now B makes sense as correct answer.
Preclude means "to prevent from happening; make impossible", hence the existence of a cluster of stars at the center would PREVENT other astronomical phenomena observed at the center of M87, therefore it cannot be a cluster of stars there.
However I did not know what "preclude" meant while I was testing so I tried to figure out a different logic that would have helped arrive at B as correct answer. I read C again, I see that I misinterpreted it and therefore could have eliminated C and chosen B just by process of elimination.
"The stars within many existing galaxies, such as NGC 4258, are more closely spaced than are the stars within the core of M87". --> Later in passage says "if 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." C only tells us that NGC 4258 was MORE closely spaced than the stars within the core of M87, so then that means the potential stars in M87 were actually farther apart than NGC 4258 and therefore could have been stars that were not torn apart. So it ultimately doesn't undermine the sentence saying that a concentration of mass could be a cluster of stars, and can be eliminated.
A and E both support the explanation so they are eliminated, and D doesn't provide any information on this other galaxy that also has gas clouds so that is eliminated. Therefore B is the answer.
I also chose C incorrectly, since I inferred that if the stars were more closely spaced than others that meant that the whirling gas must have been from a black hole. I didn't understand some of the other explanations from other users on why this was incorrect and instead B was correct, so I looked up the word "preclude" and now B makes sense as correct answer.
Preclude means "to prevent from happening; make impossible", hence the existence of a cluster of stars at the center would PREVENT other astronomical phenomena observed at the center of M87, therefore it cannot be a cluster of stars there.
However I did not know what "preclude" meant while I was testing so I tried to figure out a different logic that would have helped arrive at B as correct answer. I read C again, I see that I misinterpreted it and therefore could have eliminated C and chosen B just by process of elimination.
"The stars within many existing galaxies, such as NGC 4258, are more closely spaced than are the stars within the core of M87". --> Later in passage says "if 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." C only tells us that NGC 4258 was MORE closely spaced than the stars within the core of M87, so then that means the potential stars in M87 were actually farther apart than NGC 4258 and therefore could have been stars that were not torn apart. So it ultimately doesn't undermine the sentence saying that a concentration of mass could be a cluster of stars, and can be eliminated.
A and E both support the explanation so they are eliminated, and D doesn't provide any information on this other galaxy that also has gas clouds so that is eliminated. Therefore B is the answer.
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04 Aug 2020, 19:36
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GMATNinja Would you please explain why C is the correct answer for question 4?
