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07 Nov 2017, 10:08
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A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
35%
(medium)
Question Stats:
70% (01:39) correct
30%
(01:48)
wrong
based on 500
sessions
History
Date
Time
Result
Not Attempted Yet
Astronomers have found new evidence that the number of galaxies in the universe is not 10 billion, as previously believed, but 50 billion. This discovery will have an important effect on theories about how galaxies are formed. But even though astronomers now believe 40 billion more galaxies exist, many astronomers’ estimates of the universe’s total mass remain virtually unchanged.
Which one of the following, if true, does most to explain why the estimates remain virtually unchanged?
(A) The mass of galaxies is thought to make up only a tiny percentage of the universe’s total mass.
(B) The overwhelming majority of galaxies are so far from Earth that their mass can be only roughly estimated.
(C) The number of galaxies that astronomers believe exist tends to grow as the instruments used to detect galaxies become more sophisticated.
(D) Theories about how galaxies are formed are rarely affected by estimates of the universe’s total mass.
(E) There is no consensus among astronomers on the proper procedures for estimating the universe’s total mass.
Source: LSAT
Which one of the following, if true, does most to explain why the estimates remain virtually unchanged?
(A) The mass of galaxies is thought to make up only a tiny percentage of the universe’s total mass.
(B) The overwhelming majority of galaxies are so far from Earth that their mass can be only roughly estimated.
(C) The number of galaxies that astronomers believe exist tends to grow as the instruments used to detect galaxies become more sophisticated.
(D) Theories about how galaxies are formed are rarely affected by estimates of the universe’s total mass.
(E) There is no consensus among astronomers on the proper procedures for estimating the universe’s total mass.
Source: LSAT
09 May 2018, 03:20
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D doesn't tell us anything valuable about the premise we want to strengthen. This premise is: "Even though astronomers found more galaxies, their estimate of the total mass of the universe hasn't changed."
Quote:
This answer talks about the forming of the galaxies but doesn't indicate anything valuable about the universe's total mass. We are not concerned about the theories rather than about the unchanged estimate of the universe's total mass.
In contrast to that, let's take a look at A (correct answer)
Quote:
This tells us that even a significant increase in the number of galaxies doesn't really influence the universe's total mass. Hence, its a good strengthener for our premise saying that the estimate of the total mass will remain constant.
Hope that helps
