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Astronomer: Among recently-observed stars, LV-426 has been exhibiting

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Astronomer: Among recently-observed stars, LV-426 has been exhibiting  [#permalink]

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22 Sep 2019, 07:35
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Question Stats:

35% (02:09) correct 65% (02:10) wrong based on 142 sessions

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Astronomer: Among recently-observed stars, LV-426 has been exhibiting signs of turbulent activity. Prior to this observation, scientists speculated over whether LV-426 could become a supernova, but dismissed the possibility since the star was dormant for a prolonged period of time. It now seems likely that LV-426 will explode into a supernova, since turbulent surges of activity have been observed in every star that has transformed into a supernova.

In the astronomer’s argument, which of the following roles do the boldfaced portions play?

A. The first provides evidence for a prediction defended by the argument; the second is that prediction.

B. The first describes a situation supporting a conclusion that is reevaluated by the argument; the second is a counterargument made by the author.

C. The first describes an occurrence that does not contradict the main conclusion of the argument; the second provides the reason for that conclusion.

D. The first gives information that supports an intermediate conclusion cited in the argument; the second states the reason for that conclusion.

E. The first provides evidence in support of an observation that is dismissed in the argument; the second provides information that counters that observation.

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Re: Astronomer: Among recently-observed stars, LV-426 has been exhibiting  [#permalink]

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23 Sep 2019, 02:10

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Re: Astronomer: Among recently-observed stars, LV-426 has been exhibiting  [#permalink]

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23 Sep 2019, 02:30
How c can be the right answer. I thought the answer is E

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Re: Astronomer: Among recently-observed stars, LV-426 has been exhibiting  [#permalink]

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23 Sep 2019, 10:54
I think E should be the right Answer not C. Can you please explain the reasoning behind C being the correct answer.
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Re: Astronomer: Among recently-observed stars, LV-426 has been exhibiting  [#permalink]

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24 Sep 2019, 02:11

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Astronomer: Among recently-observed stars, LV-426 has been exhibiting  [#permalink]

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10 Oct 2019, 02:22
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Astronomer: Among recently-observed stars, LV-426 has been exhibiting  [#permalink]

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Updated on: 10 Oct 2019, 10:12
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Astronomer: Among recently-observed stars, LV-426 has been exhibiting signs of turbulent activity. Prior to this observation, scientists speculated over whether LV-426 could become a supernova, but dismissed the possibility since the star was dormant for a prolonged period of time. It now seems likely that LV-426 will explode into a supernova since turbulent surges of activity have been observed in every star that has transformed into a supernova.

In the astronomer’s argument, which of the following roles do the boldfaced portions play?

A. The first provides evidence for a prediction defended by the argument; the second is that prediction.

B. The first describes a situation supporting a conclusion that is reevaluated by the argument; the second is a counterargument made by the author.

C. The first describes an occurrence that does not contradict the main conclusion of the argument; the second provides the reason for that conclusion.

D. The first gives information that supports an intermediate conclusion cited in the argument; the second states the reason for that conclusion.

E. The first provides evidence in support of an observation that is dismissed in the argument; the second provides information that counters that observation.

The first thing that we should do is to define the argument, without which we cannot decide whether a BF is supporting or dismissing the argument.

The core argument finally is that the LV-426 is ripe to explode. "because it is now showing signs of turbulence" is the grounds on which this conclusion or argument is drawn.

However, look at E, The choice says that the info given in the second BF counters the argument. This is not so and is enough to eliminate the choice.

We must not be swayed by the fact that the first BF may be true. In BF, the premise and the inference should be congruous.

C. The first describes an occurrence that does not contradict the main conclusion of the argument; the second provides the reason for that conclusion.

In C, the first BF does not talk anything about the recent occurrence of the turbulence. It only talks about the quiet period that prevailed earlier. The second provides a reason for the main conclusion of an imminent explosion that is likely to occur because of the newly observed turbulence.

The catch in C is that the first part is neutral. It neither contradicts nor supports the core conclusion.
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Originally posted by daagh on 10 Oct 2019, 03:37.
Last edited by daagh on 10 Oct 2019, 10:12, edited 1 time in total.
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Astronomer: Among recently-observed stars, LV-426 has been exhibiting  [#permalink]

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10 Oct 2019, 09:56
Main conclusion= It is likely that LV-426 will explode into a supernova
Boldfaced part 1= A fact which is the reason for dismissing in past the possibility that LV-426 could become a supernova. This part is neither supporting nor undermining the main conclusion.
Boldfaced part 2= Evidence supporting the main conclusion

It is important to note that the part " Prior to this observation, scientists speculated over whether LV-426 could become a supernova, but dismissed the possibility since the star was dormant for a prolonged period of time." is situation that was true in the past, thus its validity can not be doubted.

C. The first describes an occurrence that does not contradict the main conclusion of the argument; the second provides the reason for that conclusion.
Correct as this option is in lines with the above explanations.

E. The first provides evidence in support of an observation that is dismissed in the argument; the second provides information that counters that observation.
Wrong because even though boldfaced part 1 is an evident supporting an observation, the argument does not dismiss that observation, which is that in the past scientists thought that LV-426 could not become a supernova. The argument merely states how the stance over LV-426 turning into a supernova changed over time. Also, second boldfaced part does not counter the speculation over LV-426 in the past. It only supports in present the possibility that LV-426 will explode into supernova.
Astronomer: Among recently-observed stars, LV-426 has been exhibiting   [#permalink] 10 Oct 2019, 09:56
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