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If a supernova (the explosion of a massive star) triggered s
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14 Apr 2019, 12:15
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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.
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17. 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
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18. 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
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19. 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.
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20. The author's attitude toward the new theory of spiral-galaxy structure can best be described as
Re: If a supernova (the explosion of a massive star) triggered s
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24 Aug 2019, 15:24
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Expert Reply
17. The primary purpose of the passage is to
(A) describe what results when a supernova triggers the creation of chains of star-forming regions
No. this is used as a premise to introduce a new theory
(B) propose a modification in the most widely accepted theory of spiral-galaxy structure
No. Because the new theory is exciting new. So, no modification
(C) compare and contrast the roles of clouds of gas and dust in two theories of spiral-galaxy structure
No contrast. In both theories, the compression clouds are part of the same theories
(D) describe a new theory of spiral-galaxy structure and contrast it with the most widely accepted theory
Correct. Blue is the contrast
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.
(E) describe a new theory of spiral-galaxy structure and discuss a reason why it is inferior to the most widely accepted theory
No inferior. It is a new way of thinking about the formation of spiral galaxies
18. 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
the wave produces supernovas
(B) affected by a density wave of spiral form
the spiral is the final result
(C) distributed in a spiral pattern
we observe the supernovas in a spiral pattern. That does not mean they are in a spiral formation
(D) located in the central plane of a galaxy
they are widespread throughout
(E) located in a differentially rotating galaxy
Correct
If many such chains were created in a differentially rotating galaxy, the distribution of stars would resemble the observed distribution in a spiral galaxy.
19. 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.
We do know how they form
(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.
The gas and dust are inside and form the stars
(C) The most massive stars formed from supernova explosions are unlikely to evolve into supernovas.
Both theories imply the formation of novas and supernovas thanks to the compression of clouds of gas and dust. Which encompass that a nova becomes a super
(D) Computer simulations of supernovas provide a poor picture of what occurs just before a supernova explosion.
No information if we do have a poor look.
(E) A density wave cannot compress clouds of gas and dust to a density high enough to create a star.
Re: If a supernova (the explosion of a massive star) triggered s
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19 May 2020, 03:17
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Zohair123 wrote:
Why is the author enthusiastic and not euphoric for the new idea in the last question? Can someone provide a hypothetical example in which the case would have been considered "Euphoric"? Because to me, the "exciting" word signaled euphoria.
People get excited for different reasons: joy, sorrow, fear etc. Scoring your target score in the GRE will make you euphoric: excited and happy. However, If you majored in Chemistry, then you might be very enthusiastic to study chemical reactions, but not necessarily happy.
Re: If a supernova (the explosion of a massive star) triggered s
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17 Sep 2019, 07:49
Q17 says, "according to the new theory of spiral-galaxy structure," which is the second paragraph. Then why is the answer derived from the first paragraph which underlies the new theory?
Re: If a supernova (the explosion of a massive star) triggered s
[#permalink]
19 May 2020, 01:09
Why is the author enthusiastic and not euphoric for the new idea in the last question? Can someone provide a hypothetical example in which the case would have been considered "Euphoric"? Because to me, the "exciting" word signaled euphoria.
Re: If a supernova (the explosion of a massive star) triggered s
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04 Oct 2020, 01:56
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19. Which of the following, if true, would most discredit the new theory as described in the passage?
Here, both C and E are tempting, If supernovas are not able to form from supernova explosions then it undermines the theory I agree. But again we see that it is said in the passage that Supernova triggered star formation from dense of clouds of gas and dust. If a supernova (the explosion of a massive star) triggered star formation from dense clouds of gas and dust So, why E is incorrect.
Re: If a supernova (the explosion of a massive star) triggered s
[#permalink]
04 Oct 2020, 02:24
Expert Reply
InHell wrote:
19. Which of the following, if true, would most discredit the new theory as described in the passage?
Here, both C and E are tempting, If supernovas are not able to form from supernova explosions then it undermines the theory I agree. But again we see that it is said in the passage that Supernova triggered star formation from dense of clouds of gas and dust. If a supernova (the explosion of a massive star) triggered star formation from dense clouds of gas and dust So, why E is incorrect.
Please Sir see my explanation above if you did not see it
Re: If a supernova (the explosion of a massive star) triggered s
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01 Oct 2024, 07:39
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Re: If a supernova (the explosion of a massive star) triggered s [#permalink]