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GMATPREP ChallengeQ -In the 1980's, astronomer Bohdan Paczyn

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Re: GMATPREP ChallengeQ -In the 1980's, astronomer Bohdan Paczyn  [#permalink]

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New post 30 Aug 2016, 00:50
Took 5 mins 10 seconds , including 2 mins 10 seconds to read
-The author describes a theory put forth by an astronomer
- The author the points out certain astronomers' concerns regarding the theory
- The author then addresses those concerns

1.
Answer E

2. "The gravity of a MACHO that had so drifted, astronomers agree, would cause the star's light rays, which would otherwise diverge, to bend together so that, as observed from Earth, the star would temporarily appear to brighten"
Answer B

3.
"all of a star's colors are equally affected by microlensing. Thus, if a MACHO magnifies a star's red light tenfold, it will do the same to the star's blue light and yellow light."
Answer D
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Re: GMATPREP ChallengeQ -In the 1980's, astronomer Bohdan Paczyn  [#permalink]

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New post 27 Oct 2016, 00:40
Easy Passage. Time Taken : 5 mins. All Correct. :)
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Re: GMATPREP ChallengeQ -In the 1980's, astronomer Bohdan Paczyn  [#permalink]

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New post 19 Jan 2017, 21:57
In the 1980's, astronomer Bohdan Paczynski proposed a way of determining whether the enormous dark halo constituting the outermost part of the Milky Way galaxy is composed of MACHO's (massive compact halo objects), which are astronomical objects too dim to be visible. Paczynski reasoned that if MACHO's make up this halo, a MACHO would occasionally drift in front of a star in the Large Magellanic Cloud, a bright galaxy near the Milky Way. The gravity of a MACHO that had so drifted, astronomers agree, would cause the star's light rays, which would otherwise diverge, to bend together so that, as observed from Earth, the star would temporarily appear to brighten, a process known as microlensing. Because many individual stars are of intrinsically variable brightness, some astronomers have contended that the brightening of intrinsically variable stars can be mistaken for microlensing. However, whereas the different colors of light emitted by an intrinsically variable star are affected differently when the star brightens, all of a star's colors are equally affected by microlensing. Thus, if a MACHO magnifies a star's red light tenfold, it will do the same to the star's blue light and yellow light. Moreover, it is highly unlikely that a star in the Large Magellanic Cloud will undergo microlensing more than once, because the chance that a second MACHO would pass in front of exactly the same star is minuscule.

2. According to the passage, Paczynski's theory presumes that if MACHO's constituted the Milky Way's dark halo, occasionally a MACHO would
A. drift so as to lie in a direct line between two stars in the outer Milky Way
B. affect the light rays of a star in the Large Magellanic Cloud with the result that the star would seem for a time to brighten
C. become obscured as a result of the microlensing of a star in the Large Magellanic Cloud
D. temporarily increase the apparent brightness of a star in the Large Magellanic Cloud by increasing the gravity of the star
E. magnify each color in the spectrum of a star in the Large Magellanic Cloud by a different amount


Hi sayantanc2k / Experts,

Can somebody explain In Question 2, why not option A is correct? In the passage it says "Paczynski reasoned that if MACHO's make up this halo, a MACHO would occasionally drift in front of a star in the Large Magellanic Cloud, a bright galaxy near the Milky Way."
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Re: GMATPREP ChallengeQ -In the 1980's, astronomer Bohdan Paczyn  [#permalink]

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New post 31 Jan 2017, 09:00
NandishSS wrote:
In the 1980's, astronomer Bohdan Paczynski proposed a way of determining whether the enormous dark halo constituting the outermost part of the Milky Way galaxy is composed of MACHO's (massive compact halo objects), which are astronomical objects too dim to be visible. Paczynski reasoned that if MACHO's make up this halo, a MACHO would occasionally drift in front of a star in the Large Magellanic Cloud, a bright galaxy near the Milky Way. The gravity of a MACHO that had so drifted, astronomers agree, would cause the star's light rays, which would otherwise diverge, to bend together so that, as observed from Earth, the star would temporarily appear to brighten, a process known as microlensing. Because many individual stars are of intrinsically variable brightness, some astronomers have contended that the brightening of intrinsically variable stars can be mistaken for microlensing. However, whereas the different colors of light emitted by an intrinsically variable star are affected differently when the star brightens, all of a star's colors are equally affected by microlensing. Thus, if a MACHO magnifies a star's red light tenfold, it will do the same to the star's blue light and yellow light. Moreover, it is highly unlikely that a star in the Large Magellanic Cloud will undergo microlensing more than once, because the chance that a second MACHO would pass in front of exactly the same star is minuscule.

2. According to the passage, Paczynski's theory presumes that if MACHO's constituted the Milky Way's dark halo, occasionally a MACHO would
A. drift so as to lie in a direct line between two stars in the outer Milky Way
B. affect the light rays of a star in the Large Magellanic Cloud with the result that the star would seem for a time to brighten
C. become obscured as a result of the microlensing of a star in the Large Magellanic Cloud
D. temporarily increase the apparent brightness of a star in the Large Magellanic Cloud by increasing the gravity of the star
E. magnify each color in the spectrum of a star in the Large Magellanic Cloud by a different amount


Hi sayantanc2k / Experts,

Can somebody explain In Question 2, why not option A is correct? In the passage it says "Paczynski reasoned that if MACHO's make up this halo, a MACHO would occasionally drift in front of a star in the Large Magellanic Cloud, a bright galaxy near the Milky Way."



Hi,
This question is actually a 'Specific' type of RC question that requires paraphrase of something directly from the passage ( no assumption) .The statment in option A can not be justified by passage. In passage line related to this mentioned is 'Paczynski reasoned that if MACHO's make up this halo, a MACHO would occasionally drift in front of a star in the Large Magellanic Cloud, a bright galaxy near the Milky Way' . If you read carefully , nowhere star's position is mentioned to be in a line between two stars. We have to find a answer which can be inferred from the passage .
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Re: GMATPREP ChallengeQ -In the 1980's, astronomer Bohdan Paczyn  [#permalink]

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New post 12 Feb 2017, 13:15
3min 40 sec including reading time. All correct.
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Re: GMATPREP ChallengeQ -In the 1980's, astronomer Bohdan Paczyn  [#permalink]

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New post 21 Feb 2017, 08:36
Time Taken: 3 mins 49 seconds. All correct.

Interesting passage. One method that helps me in such technical passages is to actually "view" the whole scenario in my mind. for eg: the Milky way, the Halo and how it affects stars(lights diverging etc..) It helps in better understanding since I already have a mental image of the whole scenario while reading the questions.
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GMATPREP ChallengeQ -In the 1980's, astronomer Bohdan Paczyn  [#permalink]

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New post 25 Sep 2017, 19:04
1
5 mins. Easy passage I guess. All correct too.
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Re: GMATPREP ChallengeQ -In the 1980's, astronomer Bohdan Paczyn  [#permalink]

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New post 03 Nov 2017, 05:37
1
This passage is too technical and was really hard to understand. I got the answers as E, B & D.

Are there any tips to tackle such passages?
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Re: GMATPREP ChallengeQ -In the 1980's, astronomer Bohdan Paczyn  [#permalink]

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New post 07 Sep 2018, 09:17
arunrnair wrote:
All correct.

Time : 8 min 20 sec.

First question consumed a lot.

Accuracy is improving ... but only small variations in time..

Experts please help



All correct.

Time : 7 min 55 sec.
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Re: GMATPREP ChallengeQ -In the 1980's, astronomer Bohdan Paczyn &nbs [#permalink] 07 Sep 2018, 09:17

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