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# It is now established that the MilkyWay is far more extended

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Manager
Joined: 16 Oct 2011
Posts: 67
Location: United States
Schools: Haas EWMBA '23
It is now established that the MilkyWay is far more extended  [#permalink]

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23 Jan 2020, 23:53
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Project RC Butler 2020 - Participate and win GMAT Club Tests.
Passage # 153 Date: 16-Jun-2020
This post is a part of Project RC Butler 2020. Click here for Details

1993 02 SECTION A 17-20

It is now established that the Milky Way is far more extended and of much greater mass than was there to thought. However, all that is visible of the constituents of the Milky Way’s corona (outer edge), where much of the galaxy’s mass must be located, is a tiny fraction of the corona’s mass. Thus, most of the Milky Way’s outlying matter must be dark.Why? Three facts are salient. First, dwarf galaxies and globular clusters, into which most of the stars of the Milky Way’s corona are probably bound, consist mainly of old stars.Second, old stars are not highly luminous. Third, no one has detected in the corona the clouds of gaseous matter such as hydrogen and carbon monoxide that are characteristic of the bright parts of a galaxy. At present, therefore, the best explanation—though still quit tentative—for the darkness of the corona is that the corona is composed mainly of old,burned-out stars.

1. ​​​The passage as a whole is primarily concerned with

(A) analyzing a current debate
(B) criticizing a well-established theory
(C) showing how new facts support a previously dismissed hypothesis
(D) stating a conclusion and adducing evidence that may justify it
(E) contrasting two types of phenomena and showing how they are related

​2. According to the passage, a bright part of a galaxy typically includes

(A) dwarf galaxies and clusters of stars
(B) a balanced mixture of old and new stars
(C) a large portion of the galaxy’s mass
(D) part of the corona of the galaxy
(E) gases such as hydrogen and carbon monoxide

3. ​​​​​It can be inferred from the passage that, compared with what they now think, until fairly recently astronomers believed that the Milky Way

(A) was much darker
(B) was much smaller
(C) was moving much more slowly
(D) had a much larger corona
(E) had much less gaseous matter

4. ​​​​​​​​The passage presents which of the following as incontrovertible?

I.​The low luminosity of old stars
II.​The absence of clouds of gaseous matter from the corona of the Milky Way
III.​The predominance of globular clusters and dwarf galaxies in the corona of the Milky Way

(A) I only
(B) III only
(C) I and II only
(D) II and III only
(E) I, II, and III

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Re: It is now established that the MilkyWay is far more extended  [#permalink]

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16 Jun 2020, 07:57
+1 Kudos to posts containing answer explanation of all questions
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Joined: 10 Oct 2017
Posts: 82
Re: It is now established that the MilkyWay is far more extended  [#permalink]

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16 Jun 2020, 12:08
2
1. ​​​The passage as a whole is primarily concerned with

(A) analyzing a current debate - No Debate has been mentioned.
(B) criticizing a well-established theory - No theory is being Criticized.
(C) showing how new facts support a previously dismissed hypothesis - No Dismissed Hypothesis is being discussed
(D) stating a conclusion and adducing evidence that may justify it - Correct - Conclusion Most of the Milky Way’s outlying matter must be dark.. Passage provides evidence for the Conclusion.
(E) contrasting two types of phenomena and showing how they are related - 2 Types of Phenomena are not mentioned.

​2. According to the passage, a bright part of a galaxy typically includes

(A) dwarf galaxies and clusters of stars - Wrong
(B) a balanced mixture of old and new stars - Out Of Scope
(C) a large portion of the galaxy’s mass - Wrong
(D) part of the corona of the galaxy - Wrong
(E) gases such as hydrogen and carbon monoxide - Correct - Given in the Passage gaseous matter such as hydrogen and carbon monoxide that are characteristic of the bright parts of a galaxy.

3. ​​​​​It can be inferred from the passage that, compared with what they now think, until fairly recently astronomers believed that the Milky Way

(A) was much darker - Wrong
(B) was much smaller - Correct - Given in the Passage It is now established that the MilkyWay is far more extended
(C) was moving much more slowly - Out Of Scope
(D) had a much larger corona - Wrong
(E) had much less gaseous matter - Out Of Scope

4. ​​​​​​​​The passage presents which of the following as incontrovertible?

I.​The low luminosity of old stars - Mentioned in the Passage old stars are not highly luminous.
II.​The absence of clouds of gaseous matter from the corona of the Milky Way - Not Mentioned
III.​The predominance of globular clusters and dwarf galaxies in the corona of the Milky Way Similar Words, but not mentioned in the Passage
(A) I only - Correct
(B) III only - Wrong
(C) I and II only - Wrong
(D) II and III only - Wrong
(E) I, II, and III - Wrong
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Joined: 30 Aug 2017
Posts: 69
GMAT 1: 730 Q50 V39 (Online)
Re: It is now established that the MilkyWay is far more extended  [#permalink]

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18 Jun 2020, 05:32
1
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May I request you to either edit the paragraph or delete this passage. The passage is clumsy, as the spaces between words are missing.
GMAT Club team member
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Posts: 6427
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Re: It is now established that the MilkyWay is far more extended  [#permalink]

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18 Jun 2020, 10:11
1
+1 Kudos to posts containing answer explanation of all questions

May I request you to either edit the paragraph or delete this passage. The passage is clumsy, as the spaces between words are missing.

Thanks for pointing it out, i have edited the passage now.
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Re: It is now established that the MilkyWay is far more extended   [#permalink] 18 Jun 2020, 10:11