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New observations about the age of some globular clusters in

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Re: New observations about the age of some globular clusters in  [#permalink]

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New post 14 Sep 2017, 19:05
why the answer is not C for Question no 6?
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Re: New observations about the age of some globular clusters in  [#permalink]

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New post 17 Sep 2017, 05:32
please explain the answers of rc new observations regarding clusters
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Re: New observations about the age of some globular clusters in  [#permalink]

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New post 26 Sep 2017, 07:42
1
ingeniouseerat wrote:
why the answer is not C for Question no 6?

Quote:
6. Which of the following most accurately states a finding of Bolte's research, as described in the passage?

(A) The globular clusters in the Milky Way galaxy are 2 billion years older than predicted by the conventional theory.
(B) The ages of at least some globular clusters in the Milky Way galaxy differ by at least 4 billion years.
(C) One of the globular clusters in the Milky Way galaxy is 5 billion years younger than most others.
(D) The globular clusters in the Milky Way galaxy are significantly older than the individual stars in the halo.
(E) Most globular clusters in the Milky Way galaxy are between 11 and 15 billion years old.

Choice (C) states a finding of Bolte's colleague, not of Bolt himself:

Quote:
A colleague of Bolte contends that the cluster called Palomar 12 is 5 billion years younger than most other globular clusters.


I hope this helps!
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Re: New observations about the age of some globular clusters in  [#permalink]

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New post 22 Oct 2017, 04:27
In Question 7, I am confused between option A and E. Could you please explain why A is wrong and E is correct?
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Re: New observations about the age of some globular clusters in  [#permalink]

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New post 25 Oct 2017, 17:07
Quote:
7. The author of the passage puts the word "renegade" (line 29) in quotation marks most probably in order to

(A) emphasize the lack of support for the theories in question
(B) contrast the controversial quality of the theories in question with the respectable character of their formulators
(C) generate skepticism about the theories in question
(D) ridicule the scientists who once doubted the theories in question
(E) indicate that the theories in question are no longer as unconventional as they once seemed

srikanth9502 wrote:
In Question 7, I am confused between option A and E. Could you please explain why A is wrong and E is correct?

The word "renegade" implies that those theories were not conventional or commonly accepted. This does not necessarily imply that those theories lacked support.

For example, there might be strong support for a theory claiming that eating hot dogs every day is good for your health. But if most people reject that theory, it would still be considered "renegade".

The author puts the word "renegade" in quotes to emphasize that those theories are gaining acceptance. For example, imagine that new evidence suggested that eating broccoli and carrots, foods commonly viewed as healthy, was in fact bad for your health. You might then say:

    I no longer want to eat "healthy" foods like broccoli and carrots.

The use of the quotation marks emphasizes that those foods were once accepted as healthy but that this view is changing. The same thing applies in this passage. The theories were once considered "renegade", but now they are becoming less and less "renegade".

I hope that helps!
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Re: New observations about the age of some globular clusters in  [#permalink]

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New post 28 Oct 2017, 02:16
I got Q5 wrong. I chose E as my answer. Somebody please help. The computer models suggest that the ideas of the scientist also apply to spiral galaxies not just within a galaxy. This clearly means that there is a wider applicability. I don't disagree with the OA but I was confused between the two and got this wrong. Is my approach wrong here? Does "wide applicability" need to be explicitly stated in the passage for E to be correct? what did I do wrong?
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Re: New observations about the age of some globular clusters in  [#permalink]

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New post 05 Nov 2017, 04:04
[box_out]
New observations about the age of some globular clusters in our Milky Way galaxy have cast doubt on a long-held theory about how the galaxy was formed. The Milky Way contains about 125 globular clusters (compact groups of anywhere from several tens of thousands to perhaps a million stars) distributed in a roughly spherical halo around the galactic nucleus. The stars in these clusters are believed to have been born during the formation of the galaxy, and so may be considered relics of the original galactic nebula, holding vital clues to the way the formation took place.

The conventional theory of the formation of the galaxy contends that roughly 12 to 13 billion years ago the Milky Way formed over a relatively short time (about 200 million years) when a spherical cloud of gas collapsed under the pressure of its own gravity into a disc surrounded by a halo. Such a rapid formation of the galaxy would mean that all stars in the halo should be very nearly the same age.

However, the astronomer Michael Bolte has found considerable variation in the ages of globular clusters. One of the clusters studied by Bolte is 2 billions years older than most other clusters in the galaxy, while another is 2 billion years younger. A colleague of Bolte contends that the cluster called Palomar 12 is 5 billion years younger than most other globular clusters.

To explain the age differences among the globular clusters, astronomers are taking a second look at “renegade” theories. One such newly fashionable theory, first put forward by Richard Larson in the early 1970’s, argues that the halo of the Milky Way formed over a period of a billion or more years as hundreds of small gas clouds drifted about, collided, lost orbital energy, and finally collapsed into a centrally condensed elliptical system. Larson’s conception of a “lumpy and turbulent” protogalaxy is complemented by computer modeling done in the 1970’s by mathematician Alan Toomre, which suggests that closely interacting spiral galaxies could lose enough orbital energy to merge into a single galaxy.
[box_in]1. The passage is primarily concerned with discussing

(A) the importance of determining the age of globular clusters in assessing when the Milky Way galaxy was formed -Incorrect. The passage is discussing various theories
(B) recent changes in the procedures used by astronomers to study the formation of the Milky Way galaxy -Incorrect
(C) current disputes among astronomers regarding the size and form of the Milky Way galaxy -No disputes have been discussed
(D) the effect of new discoveries regarding globular clusters on theories about the formation of the Milky Way galaxy -Correct. Various theories have been discussed and their effects on others have been pointed out.
(E) the origin, nature, and significance of groups of stars known as globular clusters -Incorrect

2. According to the passage, one way in which Larson's theory and the conventional theory of the formation of the Milky Way galaxy differ is in their assessment of the

(A) amount of time it took to form the galaxy -Correct. Conventional theory states that the galaxy was formed in short time while the other one states that the galaxy was formed in billions of years
(B) size of the galaxy immediately after its formation -irrelevent
(C) the particular gases involved in the formation the galaxy -irrelevant
(D) importance of the age of globular clusters in determining how the galaxy was formed -Out of scope
(E) shape of the halo that formed around the galaxy -Irrelevant

3. Which of the following, if true, would be most useful in supporting the conclusions drawn from recent observations about globular clusters?

(A) There is firm evidence that the absolute age of the Milky Way galaxy is between 10 and 17 billion years. -This is an exaggerated choice
(B) A survey reveals that a galaxy close to the Milky Way galaxy contains globular clusters of ages close to the age of Palomar 12. -Other galaxy? Incorrect
(C) A mathematical model proves that small gas clouds move in regular patterns. -Model doesn't talk about regular patterns
(D) Space probes indicate that the stars in the Milky Way galaxy are composed of several different types of gas. -types of gases? incorrect
(E) A study of over 1,500 individual stars in the halo of the Milky Way galaxy indicates wide discrepancies in their ages. -Correct.

4. If Bolte and his colleague are both correct, it can be inferred that the globular cluster Palomar 12 is approximately

(A) 5 billion years younger than any other cluster in the galaxy -any? exaggerated
(B) the same age as most other clusters in the galaxy -same age? out of scope
(C) 7 billion years younger than another cluster in the galaxy -Correct. (5+2)
(D) 12 billion years younger than most other clusters in the galaxy -12? Incorrect
(E) 2 billion years younger than most other clusters in the galaxy -Not 2 but 5

5. The passage suggests that Toomre's work complements Larson's theory because it

(A) specifies more precisely the time frame proposed by Larson -time?
(B) subtly alters Larson's theory to make it more plausible -alters?
(C) supplements Larson's hypothesis with direct astronomical observations -astronomical observations?
(D) provides theoretical support for the ideas suggested by Larson -Correct.
(E) expands Larson's theory to make it more widely applicable -expand?

6. Which of the following most accurately states a finding of Bolte's research, as described in the passage?

(A) The globular clusters in the Milky Way galaxy are 2 billion years older than predicted by the conventional theory. -incorrect
(B) The ages of at least some globular clusters in the Milky Way galaxy differ by at least 4 billion years. -correct. (2+2)
(C) One of the globular clusters in the Milky Way galaxy is 5 billion years younger than most others. -Incorrect. This was Bolte's college's observation
(D) The globular clusters in the Milky Way galaxy are significantly older than the individual stars in the halo. -out of scope
(E) Most globular clusters in the Milky Way galaxy are between 11 and 15 billion years old. -exaggerated

7. The author of the passage puts the word "renegade" (line 29) in quotation marks most probably in order to
--I didn't know the meaning of "renegade" but solved it using the context of the passage.
(A) emphasize the lack of support for the theories in question -A mathematical model supports a theory. Incorrect
(B) contrast the controversial quality of the theories in question with the respectable character of their formulators -Character of the inventors is not discussed. Incorrect
(C) generate skepticism about the theories in question -The passage is not generating any skepticism regarding the theories.
(D) ridicule the scientists who once doubted the theories in question -The last para is definitely not ridiculing anyone
(E) indicate that the theories in question are no longer as unconventional as they once seemed -Correct. Only remaining choice, that also makes sense as per the passage
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Re: New observations about the age of some globular clusters in  [#permalink]

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New post 14 Jul 2018, 12:23
13 mins


1 wrong

3rd question,,,,can anyone pls explain?
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Re: New observations about the age of some globular clusters in  [#permalink]

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New post 14 Jul 2018, 14:29
I got 7/7 right
Good job
:shocked
I can read better
Yayayayayay
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Re: New observations about the age of some globular clusters in  [#permalink]

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New post 16 Jul 2018, 07:14
Attempted5Correct 5

;) skipped 3 and 7 ( found them tricky
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Re: New observations about the age of some globular clusters in  [#permalink]

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New post 10 Aug 2018, 12:13

Question 3


Bob2018 wrote:
3rd question,,,,can anyone pls explain?

Quote:
3. Which of the following, if true, would be most useful in supporting the conclusions drawn from recent observations about globular clusters?

The conclusion drawn from recent observations about globular clusters is that The Milky Way may have formed from the collapse of many clusters into a single galaxy, over a long period of time. Here's how this conclusion is presented in the structure of the passage:

  • P1: The Milky Way is formed of many (~125) globular clusters distributed in a halo around the galactic nucleus. This distribution holds vital clues to how the galaxy was formed.
  • P2: Conventional theory says: The Milky Way was formed in a short period of time (~200 million years), from the collapse of a single spherical cloud of gas. This implies that all stars in the halo should be nearly the same age.
  • P3: Bolte has found discrepancies in the age of stars as large at 2 billion years. His findings challenge the conventional theory.
  • P4: Larsons' "renegade" theory explains these discrepancies by arguing that the Milky Way was actually formed from multiple gas clouds. Toomre's models support this theory by suggesting how multiple galaxies could merge into one.

The best answer choice will back up these recent observations of age discrepancies within the galactic halo (wow, I am so glad I got to say "galactic halo") or reinforce the "renegade" theory by explaining how multiple galaxies could become one.

Quote:
(A) There is firm evidence that the absolute age of the Milky Way galaxy is between 10 and 17 billion years.

Why do we care about the absolute age of the Milky Way as a whole? We're looking for information about the age of stars in the halo. This is irrelevant to the question being asked, so we we'll eliminate (A).

Quote:
(B) A survey reveals that a galaxy close to the Milky Way galaxy contains globular clusters of ages close to the age of Palomar 12.

We're only concerned about explaining age discrepancies within the Milky Way galaxy. Knowing the age of clusters in another galaxy altogether (especially if this knowledge doesn't tell us anything about how they fit into the bigger picture for that galaxy) won't help us strengthen or weaken the conclusion we care about, so let's eliminate (B).

Quote:
(C) A mathematical model proves that small gas clouds move in regular patterns.

Without more information about how these regular patterns result (or don't result) in collisions and the loss of orbital energy, we can't tie this model back to the theory of many galaxies becoming one Milky Way. Let's eliminate (C).

Quote:
(D) Space probes indicate that the stars in the Milky Way galaxy are composed of several different types of gas.

As with choice (C), knowing that there are different types of gas doesn't help us bridge the logical gap between many galaxies existing and many galaxies merging. Eliminate (D).

Quote:
(E) A study of over 1,500 individual stars in the halo of the Milky Way galaxy indicates wide discrepancies in their ages.

This choice explicitly reinforces the conclusion by telling us that many individual stars in the halo of the Milky Way have wide discrepancies in age. If true, we've just taken the example of Palomar and multiplied by it by 1,500. This adds a great amount of quantitative support to Bolte's recent findings. It directly attacks the conventional theory by showing exactly how much variance we're seeing in the age of stars in this halo. It's by far the best answer choice, so we'll stick with (E) and move on.

Question 5


Quote:
5. The passage suggests that Toomre's work complements Larson's theory because it:

In the final paragraph, the author presents "renegade" theories that could explain the large age discrepancies between globular clusters. Larson's theory is that hundreds of small gas clouds, rather than a single gas cloud, formed what we observe today as one galaxy: the Milky Way. Toomre's computer modeling suggests that multiple spiral galaxies could indeed merge into a single galaxy. Larson's work and Toomre's work reinforce each other, because both illustrate the same theoretical statement: Multiple galaxies can become one, over time.

ShashankDave wrote:
I got Q5 wrong. I chose E as my answer. Somebody please help.The computer models suggest that the ideas of the scientist also apply to spiral galaxies not just within a galaxy. This clearly means that there is a wider applicability. I don't disagree with the OA but I was confused between the two and got this wrong. Is my approach wrong here? Does "wide applicability" need to be explicitly stated in the passage for E to be correct? what did I do wrong?

Now that we've clarified the purpose of this paragraph, let's take a closer look at these two choices.

Quote:
(D) provides theoretical support for the ideas suggested by Larson

As you know, (D) most closely captures what we've just read. Toomre's models suggest that multiple galaxies could lose enough energy to merge into one. This provides support for the Larson's big-picture theory (multiple gas clouds becoming one system) as well as the specific process at the heart of that theory (losing orbital energy).

Quote:
(E) expands Larson's theory to make it more widely applicable

The key words here aren't only "widely applicable." We also have to decide whether Toomre's work is really expanding Larson's theory, because we're being asked how Toomre's work is complementing Larson's. We should eliminate (E) if either of these phrases aren't supported by the passage.

Let's recall why the author brought up Larson and Toomre in the first place: Both works suggest that many galaxies (whether worded as "hundreds of small gas clouds" or "closely interacting spiral galaxies") could become one. So the point of modeling spiral galaxies isn't to look at one galaxy and apply observations about it to many different kinds. The point is to illustrate how these multiple galaxies could have merged into a single galaxy.

Toomre's modeling shows how orbital energy plays a role in this merge, but it does not expand the theory of "many become one"...nor does it show us other ways that theory can be applied (for instance, to things that aren't galaxies at all). That's why we eliminate (E). It's more about matching the author's reason for bringing up another person's work than it is about matching specific keywords from choice to passage.

I hope this helps you... um, feel like you're surrounded by a galactic halo...?
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