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If a supernova (the explosion of a massive star) triggered star format

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If a supernova (the explosion of a massive star) triggered star format  [#permalink]

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New post Updated on: 25 Sep 2019, 23:46
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New Project RC Butler 2019 - Practice 2 RC Passages Everyday
Passage # 145, Date : 14-APR-2019
This post is a part of New Project RC Butler 2019. Click here for Details


If a supernova (the explosion of a massive star) triggered star formation from dense clouds of gas and dust, and if the most massive star to be formed from the cloud evolved into a supernova and triggered a new round of star formation, and so on, then a chain of star-forming regions would result. If many such chains were created in a differentially rotating galaxy, the distribution of stars would resemble the observed distribution in a spiral galaxy.

This line of reasoning underlies an exciting new theory of spiral-galaxy structure. A computer simulation based on this theory has reproduced the appearance of many spiral galaxies without assuming an underlying density wave, the hallmark of the most widely accepted theory of the large-scale structure of spiral galaxies. That theory maintains that a density wave of spiral form sweeps through the central plane of a galaxy, compressing clouds of gas and dust, which collapse into stars that form a spiral pattern.
1. The primary purpose of the passage is to

(A) describe what results when a supernova triggers the creation of chains of star-forming regions
(B) propose a modification in the most widely accepted theory of spiral-galaxy structure
(C) compare and contrast the roles of clouds of gas and dust in two theories of spiral-galaxy structure
(D) describe a new theory of spiral-galaxy structure and contrast it with the most widely accepted theory
(E) describe a new theory of spiral-galaxy structure and discuss a reason why it is inferior to the most widely accepted theory
Spoiler: :: OA
D


2. The passage implies that, according to the new theory of spiral-galaxy structure, a spiral galaxy can be created by supernovas when the supernovas are

(A) producing an underlying density wave
(B) affected by a density wave of spiral form
(C) distributed in a spiral pattern
(D) located in the central plane of a galaxy
(E) located in a differentially rotating galaxy
Spoiler: :: OA
E


3. Which of the following, if true, would most discredit the new theory as described in the passage?

(A) The exact mechanism by which a star becomes a supernova is not yet completely known and may even differ for different stars.
(B) Chains of star-forming regions like those postulated in the new theory have been observed in the vicinity of dense clouds of gas and dust.
(C) The most massive stars formed from supernova explosions are unlikely to evolve into supernovas.
(D) Computer simulations of supernovas provide a poor picture of what occurs just before a supernova explosion.
(E) A density wave cannot compress clouds of gas and dust to a density high enough to create a star.
Spoiler: :: OA
C


4. The author's attitude toward the new theory of spiral-galaxy structure can best be described as

(A) euphoric
(B) enthusiastic
(C) concerned
(D) critical
(E) disputatious
Spoiler: :: OA
B



Source: GRE OG Big Book
Difficulty Level: 700

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Originally posted by carcass on 14 Apr 2019, 12:19.
Last edited by SajjadAhmad on 25 Sep 2019, 23:46, edited 4 times in total.
Updated - Complete topic (664).
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Re: If a supernova (the explosion of a massive star) triggered star format  [#permalink]

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New post 17 Apr 2019, 17:03
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1. The primary purpose of the passage is to

(A) describe what results when a supernova triggers the creation of chains of star-forming regions - out of scope
(B) propose a modification in the most widely accepted theory of spiral-galaxy structure - Inconsistent. the author is not proposing anything
(C) compare and contrast the roles of clouds of gas and dust in two theories of spiral-galaxy structure - out of scope
(D) describe a new theory of spiral-galaxy structure and contrast it with the most widely accepted theory - at the end, he compared the new theory without DM with the existing theory of DM.
(E) describe a new theory of spiral-galaxy structure and discuss a reason why it is inferior to the most widely accepted theory - Inconsistent. He did not claim with theory is right or above another one.

2. The passage implies that, according to the new theory of spiral-galaxy structure, a spiral galaxy can be created by supernovas when the supernovas are

(A) producing an underlying density wave - out of scope. new theory does not talk about the DM
(B) affected by a density wave of spiral form - out of scope
(C) distributed in a spiral pattern - out of scope
(D) located in the central plane of a galaxy - out of scope
(E) located in a differentially rotating galaxy - can be implied according to the first para.

3. Which of the following, if true, would most discredit the new theory as described in the passage?

(A) The exact mechanism by which a star becomes a supernova is not yet completely known and may even differ for different stars. - out of scope
(B) Chains of star-forming regions like those postulated in the new theory have been observed in the vicinity of dense clouds of gas and dust. - opposite
(C) The most massive stars formed from supernova explosions are unlikely to evolve into supernovas. - If they are unlikely to form supernovas, then star formation cannot happen which would not resemble to spiral galaxy. This will discredit the new theory
(D) Computer simulations of supernovas provide a poor picture of what occurs just before a supernova explosion. - inconsistent
(E) A density wave cannot compress clouds of gas and dust to a density high enough to create a star. - out of scope. New theory does not talk about DM

4. The author's attitude toward the new theory of spiral-galaxy structure can best be described as

The word "exciting " as stated in the 2nd para shows the behavior of the author

(A) euphoric - out of scope. He is not happy or cheerful
(B) enthusiastic - the enthusiasm made him compare the new theory with the DM theory
(C) concerned - out of scope
(D) critical - out of scope
(E) disputatious - out of scope
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Re: If a supernova (the explosion of a massive star) triggered star format  [#permalink]

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New post 16 Apr 2019, 01:54
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+1 Kudos to posts containing answer explanation of all questions
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Re: If a supernova (the explosion of a massive star) triggered star format  [#permalink]

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New post 07 May 2019, 20:58
tapasgupta wrote:
4. The author's attitude toward the new theory of spiral-galaxy structure can best be described as

The word "exciting " as stated in the 2nd para shows the behavior of the author

(A) euphoric - out of scope. He is not happy or cheerful
(B) enthusiastic - the enthusiasm made him compare the new theory with the DM theory
(C) concerned - out of scope
(D) critical - out of scope
(E) disputatious - out of scope



What! "the enthusiasm made him compare the new theory with the DM theory " why isn't this disputatious?
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Re: If a supernova (the explosion of a massive star) triggered star format  [#permalink]

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New post 11 May 2019, 08:11
prototypevenom wrote:
tapasgupta wrote:
4. The author's attitude toward the new theory of spiral-galaxy structure can best be described as

The word "exciting " as stated in the 2nd para shows the behavior of the author

(A) euphoric - out of scope. He is not happy or cheerful
(B) enthusiastic - the enthusiasm made him compare the new theory with the DM theory
(C) concerned - out of scope
(D) critical - out of scope
(E) disputatious - out of scope



What! "the enthusiasm made him compare the new theory with the DM theory " why isn't this disputatious?


This line of reasoning underlies an exciting new theory of spiral-galaxy structure.
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Re: If a supernova (the explosion of a massive star) triggered star format  [#permalink]

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New post 18 Jul 2019, 02:34
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In ques no 2. The new theory doesnot say anything about supernovas located in a differentially rotating galaxy.as it is mentioned on 1st theory only.

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Re: If a supernova (the explosion of a massive star) triggered star format  [#permalink]

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New post 20 Jul 2019, 22:47
Issue with the 3rd answer. Just because it says "unlikely" doesn't mean its impossible. The passage uses "if" at multiple stages to denote its not a common occurrence or it definitely needs specific conditions to occur in. I think the answer should be the first option.

Can someone help me out?
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Re: If a supernova (the explosion of a massive star) triggered star format  [#permalink]

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New post 23 Jul 2019, 03:55
If many such chains were created in a differentially rotating galaxy, the distribution of stars would resemble the observed distribution in a spiral galaxy. This line of reasoning underlies an exciting new theory of spiral-galaxy structure.

You can find the answer in above mentioned lines.

Krishnashrestha wrote:
In ques no 2. The new theory doesnot say anything about supernovas located in a differentially rotating galaxy.as it is mentioned on 1st theory only.

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Re: If a supernova (the explosion of a massive star) triggered star format   [#permalink] 23 Jul 2019, 03:55

If a supernova (the explosion of a massive star) triggered star format

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