Last visit was: 17 Jul 2025, 05:42 It is currently 17 Jul 2025, 05:42
Close
GMAT Club Daily Prep
Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Close
Request Expert Reply
Confirm Cancel
User avatar
carcass
User avatar
Board of Directors
Joined: 01 Sep 2010
Last visit: 16 Jul 2025
Posts: 4,726
Own Kudos:
36,187
 [11]
Given Kudos: 4,813
Posts: 4,726
Kudos: 36,187
 [11]
3
Kudos
Add Kudos
8
Bookmarks
Bookmark this Post
Most Helpful Reply
User avatar
tapasgupta
Joined: 10 Mar 2016
Last visit: 20 May 2023
Posts: 117
Own Kudos:
238
 [6]
Given Kudos: 22
Location: India
Concentration: Finance, Real Estate
GMAT 1: 550 Q44 V23
WE:Corporate Finance (Commercial Banking)
Products:
GMAT 1: 550 Q44 V23
Posts: 117
Kudos: 238
 [6]
6
Kudos
Add Kudos
Bookmarks
Bookmark this Post
General Discussion
User avatar
prototypevenom
Joined: 12 Nov 2018
Last visit: 23 Apr 2024
Posts: 77
Own Kudos:
Given Kudos: 63
Posts: 77
Kudos: 42
Kudos
Add Kudos
Bookmarks
Bookmark this Post
avatar
HAPPYatHARVARD
Joined: 07 Apr 2018
Last visit: 11 Apr 2020
Posts: 77
Own Kudos:
Given Kudos: 271
Location: United States
Concentration: General Management, Marketing
GMAT 1: 600 Q45 V28
GPA: 3.8
GMAT 1: 600 Q45 V28
Posts: 77
Kudos: 65
Kudos
Add Kudos
Bookmarks
Bookmark this Post
prototypevenom
tapasgupta
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.
avatar
Krishnashrestha
Joined: 16 Jul 2019
Last visit: 01 Sep 2019
Posts: 1
Own Kudos:
1
 [1]
Given Kudos: 5
Posts: 1
Kudos: 1
 [1]
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
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.

Posted from my mobile device
avatar
[email protected]
Joined: 01 Nov 2015
Last visit: 28 Jan 2020
Posts: 10
Given Kudos: 6
Posts: 10
Kudos: 0
Kudos
Add Kudos
Bookmarks
Bookmark this Post
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?
User avatar
nick1816
User avatar
Retired Moderator
Joined: 19 Oct 2018
Last visit: 28 Jun 2025
Posts: 1,853
Own Kudos:
Given Kudos: 707
Location: India
Posts: 1,853
Kudos: 7,837
Kudos
Add Kudos
Bookmarks
Bookmark this Post
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
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.

Posted from my mobile device
User avatar
bidskamikaze
Joined: 07 Jan 2018
Last visit: 29 Oct 2022
Posts: 262
Own Kudos:
Given Kudos: 160
Location: India
GMAT 1: 710 Q49 V38
GMAT 1: 710 Q49 V38
Posts: 262
Kudos: 289
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Hi Sajjad1994 ,

Could you please provide the OE of Question 3? I am confused between C and D

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.

The passage states:
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.
Also, choice C states that massive stars formed from supernova explosions are unlikely to evolve into supernovas - this would mean that the probability of such supernova explosions forming another supernova is low, but not impossible.

On the other hand, choice D states that Computer simulations of supernovas provide a poor picture of what occurs just before a supernova explosion.
This could mean that the old theory,which 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 may still be true ?

Am I missing something? :roll:­
User avatar
Sajjad1994
User avatar
GRE Forum Moderator
Joined: 02 Nov 2016
Last visit: 17 Jul 2025
Posts: 15,854
Own Kudos:
Given Kudos: 6,083
GPA: 3.62
Posts: 15,854
Kudos: 46,483
Kudos
Add Kudos
Bookmarks
Bookmark this Post
bidskamikaze
Hi Sajjad1994 ,

Could you please provide the OE of Question 3? I am confused between C and D

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.

The passage states:
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.
Also, choice C states that massive stars formed from supernova explosions are unlikely to evolve into supernovas - this would mean that the probability of such supernova explosions forming another supernova is low, but not impossible.

On the other hand, choice D states that Computer simulations of supernovas provide a poor picture of what occurs just before a supernova explosion.
This could mean that the old theory,which 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 may still be true ?

Am I missing something? :roll:
OE is not available please refer to the explanation posted in the link below

https://gmatclub.com/forum/if-a-superno ... l#p2261868­
User avatar
jannat0718
Joined: 25 Jan 2023
Last visit: 27 Feb 2023
Posts: 2
Given Kudos: 21
Location: Bangladesh
GRE 1: Q158 V146
GRE 1: Q158 V146
Posts: 2
Kudos: 0
Kudos
Add Kudos
Bookmarks
Bookmark this Post
I would appreciate if anyone could able to to break down the passage for me? I found it so hard to understand even.

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, 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 reasoningunderlies an exciting new theory of spiral-galaxy structure.-- what is this reasoning?

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. --isn't it means that a supernova can happen without even the dense cloud of gas involvement and form a spiral pattern in a different galaxy?

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.--is it talking about the old theory where supernov form from dust and gas?
User avatar
GTLH
Joined: 30 Dec 2023
Last visit: 20 Jun 2025
Posts: 7
Given Kudos: 9
Posts: 7
Kudos: 0
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Hi. Can someone explain why Q1 (A) is wrong? The result is a spiral pattern isn't it?
User avatar
Nivev
Joined: 07 Aug 2024
Last visit: 22 Feb 2025
Posts: 7
Own Kudos:
Given Kudos: 41
Posts: 7
Kudos: 1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
GTLH
Hi. Can someone explain why Q1 (A) is wrong? The result is a spiral pattern isn't it?
Hi.. The primary purpose is asked here. There are two theories in the passage. Both of them are about spiral galaxies but have different explanations of their formation. Supernova has been mentioned in the first theory, but not in the second. The second theory deals with density wave, a different factor like supernova in the first. So the primary purpose is not revolving around supernova and you can eliminate it.
Moderators:
GMAT Club Verbal Expert
7359 posts
GMAT Club Verbal Expert
235 posts
GRE Forum Moderator
15854 posts