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Reading Comprehension (RC) | Re: After evidence was obtained in the 1920s that the universe

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Q. 118 - if the density of the universe were equivalent to significantly less than 3 HA/CM
For this I referred 1st paragraph of the passage. If mentions that "is there enough mass in it for the mutual attraction of its constituents to bring this expansion to a halt"?God knows what it means - mutual attraction of.. enough mass..! Whoa!
Okay - so does this mean that in order to halt the universe expansion, we need mutual attraction of (some of) its constituents, and this needs enough
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