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In addition to conventional galaxies, the universe contains

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avigutman
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Re: In addition to conventional galaxies, the universe contains [#permalink] New post   01 Sep 2022, 06:03
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Elite097 wrote:
the last para talking about a situation that shows there are more baryons and this is inconsistent with the situation that these galaxies can help account for Missing baryons

Can you elaborate on how the above qualifies as an inconsistency please, Elite097? I’m not seeing it unfortunately.

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Re: In addition to conventional galaxies, the universe contains [#permalink] New post   01 Sep 2022, 11:55
avigutman wrote:
Elite097 wrote:
the last para talking about a situation that shows there are more baryons and this is inconsistent with the situation that these galaxies can help account for Missing baryons

Can you elaborate on how the above qualifies as an inconsistency please, Elite097? I’m not seeing it unfortunately.

Posted from my mobile device


avigutman

First line of second para says that 'the discovery answers the puzzle of missing bryonic mass' implying that the discovery shows that there is no bryonic mass whereas astronomers have earlier believed that this mass exists in intergalatic spaces and galaxies hard to detect so these two are inconsistent. Also is it reasonable to infer galaxies hard to detect is same as 'dim galaxies'?
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In addition to conventional galaxies, the universe contains [#permalink] New post   01 Sep 2022, 14:53
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Elite097 wrote:
First line of second para says that 'the discovery answers the puzzle of missing baryonic mass' implying that the discovery shows that there is no baryonic mass
Sorry, Elite097, I'm not seeing the implication that you're seeing above.
Elite097 wrote:
Also is it reasonable to infer galaxies hard to detect is same as 'dim galaxies'?

Well, the fact that some galaxies are very dim (low-surface-brightness galaxies, as they are called), is what makes them hard to detect.
When A is a reason for B, it's inaccurate to say that A is the same as B. Perhaps my head hit the ceiling because I'm very tall - but I wouldn't say that being very tall is the same thing as having the head hit the ceiling.
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In addition to conventional galaxies, the universe contains [#permalink] New post   01 Sep 2022, 22:32
avigutman wrote:
Elite097 wrote:
First line of second para says that 'the discovery answers the puzzle of missing baryonic mass' implying that the discovery shows that there is no baryonic mass
Sorry, Elite097, I'm not seeing the implication that you're seeing above.
Elite097 wrote:
Also is it reasonable to infer galaxies hard to detect is same as 'dim galaxies'?

Well, the fact that some galaxies are very dim (low-surface-brightness galaxies, as they are called), is what makes them hard to detect.
When A is a reason for B, it's inaccurate to say that A is the same as B. Perhaps my head hit the ceiling because I'm very tall - but I wouldn't say that being very tall is the same thing as having the head hit the ceiling.


avigutman basically i do not understand the second para at all line by line and relation of lines to each other and structure and purpose of each line, the contrast, the purpose of the contrast, the purpose of introducing last line etc

Well I Mean are these hard to detect galaxies referring to dim galaxies and can that be inferred reasonable?
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In addition to conventional galaxies, the universe contains [#permalink] New post   03 Sep 2022, 05:38
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Elite097 wrote:
basically i do not understand the second para at all line by line and relation of lines to each other and structure and purpose of each line, the contrast, the purpose of the contrast, the purpose of introducing last line etc

Primary purpose questions are easier to answer when we don't read any of the details. Try the question again, reading just this:
Quote:
In addition to conventional galaxies, the universe contains very dim galaxies that until recently went unnoticed by astronomers.
These galaxies may constitute an answer to the long-standing puzzle of the missing baryonic mass in the universe.
Astronomers have long speculated that the missing baryonic mass might eventually be discovered in intergalactic space or as some large population of galaxies that are difficult to detect.

That's all that should be read in your initial read of the passage, Elite097. The details' purpose is to confuse you as to the primary purpose of the passage, and each wrong answer choice will take advantage of that confusion.
I demonstrate this strategy in these videos:
https://youtu.be/3NnZEUK1rCE
https://youtu.be/Qyd5onrqTgc
https://youtu.be/hejdaJrbXvE
Elite097 wrote:
Well I Mean are these hard to detect galaxies referring to dim galaxies and can that be inferred reasonable?

Yes.
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In addition to conventional galaxies, the universe contains [#permalink] New post   05 Sep 2022, 03:43
avigutman I wish it helped to do that i would have not had a doubt. i am still not clear about the second para and how they all relate to each other and purpose of the lines and still think it is inconsistent

avigutman wrote:
Elite097 wrote:
basically i do not understand the second para at all line by line and relation of lines to each other and structure and purpose of each line, the contrast, the purpose of the contrast, the purpose of introducing last line etc

Primary purpose questions are easier to answer when we don't read any of the details. Try the question again, reading just this:
Quote:
In addition to conventional galaxies, the universe contains very dim galaxies that until recently went unnoticed by astronomers.
These galaxies may constitute an answer to the long-standing puzzle of the missing baryonic mass in the universe.
Astronomers have long speculated that the missing baryonic mass might eventually be discovered in intergalactic space or as some large population of galaxies that are difficult to detect.

That's all that should be read in your initial read of the passage, Elite097. The details' purpose is to confuse you as to the primary purpose of the passage, and each wrong answer choice will take advantage of that confusion.
I demonstrate this strategy in these videos:
https://youtu.be/3NnZEUK1rCE
https://youtu.be/Qyd5onrqTgc
https://youtu.be/hejdaJrbXvE
Elite097 wrote:
Well I Mean are these hard to detect galaxies referring to dim galaxies and can that be inferred reasonable?

Yes.
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Re: In addition to conventional galaxies, the universe contains [#permalink] New post   05 Sep 2022, 07:29
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Elite097 wrote:
avigutman I wish it helped to do that i would have not had a doubt. i am still not clear about the second para and how they all relate to each other and purpose of the lines and still think it is inconsistent

To be clear, Elite097, are you saying that you'd still pick (E) had you only read the part that I suggested?
Regarding being unclear on the details of the second para: why do you wish to have clarity? If it's for GMAT purposes, I suggest that you get comfortable with a lack of clarity on the details. If it's for your general life reading skills, I suggest that you dissect answer choice (E) as follows:
Quote:
discuss a discovery and point out its inconsistency with existing theory

1. What is the discovery being discussed?
2. What is the existing theory?
3. In what way, specifically, are the discovery and the existing theory inconsistent?
4. Where, or how, can we tell that pointing out the inconsistency was the author's primary purpose?

I could provide you with a full analysis of the second paragraph, line by line, Elite097, but that wouldn't help you at all, beyond this particular passage.
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In addition to conventional galaxies, the universe contains [#permalink] New post   01 Feb 2023, 12:41
avigutman thats because i dont get what eac line is doing and how it relates and what is eing conveyed.

Discovery is of dim galaxies. Also not sure what phenomenon is taking place. Existing theory- what they discussed through helium


avigutman wrote:
Elite097 wrote:
avigutman I wish it helped to do that i would have not had a doubt. i am still not clear about the second para and how they all relate to each other and purpose of the lines and still think it is inconsistent

To be clear, Elite097, are you saying that you'd still pick (E) had you only read the part that I suggested?
Regarding being unclear on the details of the second para: why do you wish to have clarity? If it's for GMAT purposes, I suggest that you get comfortable with a lack of clarity on the details. If it's for your general life reading skills, I suggest that you dissect answer choice (E) as follows:
Quote:
discuss a discovery and point out its inconsistency with existing theory

1. What is the discovery being discussed?
2. What is the existing theory?
3. In what way, specifically, are the discovery and the existing theory inconsistent?
4. Where, or how, can we tell that pointing out the inconsistency was the author's primary purpose?

I could provide you with a full analysis of the second paragraph, line by line, Elite097, but that wouldn't help you at all, beyond this particular passage.
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Re: In addition to conventional galaxies, the universe contains [#permalink] New post   02 Feb 2023, 00:30
Can anyone explain, why B is not correct option for Question no.07?
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Re: In addition to conventional galaxies, the universe contains [#permalink] New post   02 Feb 2023, 01:12
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ANKITK13 wrote:
Can anyone explain, why B is not correct option for Question no.07?


Official Explanation


7. The primary purpose of the passage is to

Difficulty Level: 600

Explanation

Main idea

This question requires understanding, in broad terms, the purpose of the passage as a whole. The first paragraph describes a phenomenon: the discovery of dim galaxies and some of their general attributes. The second paragraph describes how this discovery may help astronomers to solve a long-standing puzzle about the baryonic mass of the universe.

A. Correct. The passage describes the phenomenon of dim galaxies and describes their significance in solving the long-standing puzzle of the missing baryonic mass in the universe.

B. Although the passage discusses the puzzling difference between the two estimates of baryonic mass, this option does not account for the broader topic of dim galaxies.

C. While the passage identifies the newly discovered phenomenon of dim galaxies, it does not offer a significant explanation for these galaxies’ origins.

D. Although the passage compares dim and conventional galaxies in the first paragraph, this option does not account for the important detail that dim galaxies may help solve a long-standing puzzle.

E. The discovery of dim galaxies discussed in the passage is not said to be inconsistent with any existing scientific theory.

Answer: A
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Re: In addition to conventional galaxies, the universe contains [#permalink] New post   13 Jul 2023, 19:57
This should not be a 700 - Level question.
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Re: In addition to conventional galaxies, the universe contains [#permalink] New post   14 Jul 2023, 12:44
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ShawnQ wrote:
This should not be a 700 - Level question.


Agreed, Edited the tag.

Thank you!
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In addition to conventional galaxies, the universe contains [#permalink] New post   09 Apr 2024, 10:17
In the second question (It can be inferred from the passage that which of the following is an accurate physical description of typical low-surface-brightness galaxies?) I chose (A) since in the first paragraph says 'they have far fewer stars per unit volume than do conventional galaxies' and in combination with the fact that they are larger than conventional galaxies I inferred that they have fewer stars in total (for instance 10 stars per unit volume instead of 15, so they have 5 few per unit volume). 

Where am I mistaken?? GMATCoachBen GMATNinja avigutman chetan2u

Thanks in advance­
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Re: In addition to conventional galaxies, the universe contains [#permalink] New post   10 Apr 2024, 02:11
GMATCoachBen wrote:
Gmatguy007 wrote:
In the second question (It can be inferred from the passage that which of the following is an accurate physical description of typical low-surface-brightness galaxies?) I chose (A) since in the first paragraph says 'they have far fewer stars per unit volume than do conventional galaxies' and in combination with the fact that they are larger than conventional galaxies I inferred that they have fewer stars in total (for instance 10 stars per unit volume instead of 15, so they have 5 few per unit volume). 

Where am I mistaken?? GMATCoachBen GMATNinja avigutman chetan2u

Thanks in advance­

­Gmatguy007

(A) They are large spiral galaxies containing fewer stars than do conventional galaxies.


2 problems with A:

1) It directly says in lines 4-5:

"these galaxies have the same general shape and even the same approximate number of stars"

2) The 2 facts you cite OFFSET each other:

(Fewer stars per unit volume) * (LARGER volume) = potentially the same number of stars, since these 2 variables could offset each other


In general, we want to get extremely comfortable with all kinds of rates, since these are all over the GMAT; we multiply the rate by the denominator in the rate.

For example:

(Passengers / Flight) * Flights = Passengers

($ / Unit) * Units = $

(Miles / Gallon) * Gallons = Miles


 

­I read the 4th line but then I thought that maybe it's a kind of trap given that per unit there are more stars.

Thanks a lot for your help Ben!
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Re: In addition to conventional galaxies, the universe contains [#permalink]
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