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  3. 　　We cannot see it, we barely understand it, yet we know it exists because of the powerful influence it exerts on space. Dark ma

　　We cannot see it, we barely understand it, yet we know it exists because of the powerful influence it exerts on space. Dark ma

admin2022-02-15  23
问题 　　We cannot see it, we barely understand it, yet we know it exists because of the powerful influence it exerts on space. Dark matter makes up about 27% of the universe, and its gravitational force is enough to mesh entire galaxies together in a structure known as the cosmic web. Scientists have now created the largest map to date of this mysterious substance, but they find it could imply there is something wrong with Einstein’s theory of relativity.
　　Using artificial intelligence methods to analyse images of 100M galaxies, members of the international Dark Energy Survey (DES) team—which works on revealing the nature of the dark energy driving the expansion of our universe—have created a map that covers a quarter of the southern celestial hemisphere. Visualised as pink, purple and black-mottled patches, clustered inside a pale ring, the brightest areas of the map reveal the densest areas of dark matter, corresponding to super clusters of galaxies. The black patches are cosmic voids.
　　Dr. Niall Jeffrey said: " We can really see this cosmic web structure, including these enormous structures called cosmic voids, which are very low density regions of the universe where there are very few galaxies and less matter. " Scientists are interested in these structures because they suspect that gravity could behave very differently inside them. By identifying their shapes and locations, the map could provide a starting point for further study.
　　According to the standard model of cosmology, the universe started with the " big bang" then expanded. Although calculations by the DES team suggest the distribution of this matter is broadly consistent with the predictions in the standard model, it is not a perfect fit. " If you look out into the universe, the matter isn’t as clumpy as expected, there are hints that are smoother," said Jeffrey. " It may seem a relatively small thing, but if these hints are true then it may mean there’s something wrong with Einstein’s theory of general relativity, one of the great pillars of physics. " One possibility is that some of the measurements that have been used to calculate how the universe should look are not correct. Alternatively, it could be a problem with the underlying model.
　　Ofer, a co-author of the study, was not prepared to go that far but added; "What I say is, look, don’t be too relaxed. There’s something there which might indicate a disparity. Work hard, try to understand it by conventional means, but keep your eyes open that it could lead to a revolution in physics. "
We can perceive the existence of dark matter due to_________.
选项 A、the expansion of universe
B、the mighty impact on universe
C、the enormous cosmic web
D、the advanced astronomical telescope
答案B
解析 细节题。根据题于可定位至第一段。第一段中并没有提到宇宙的膨胀，选项A为无中生有，故排除；根据选项C可定位至第二句，但这并不是我们能感知到暗物质存在的原因，故排除；同理，原文中并没有提到观测工具，选项D为主观臆测，故排除；选项B中mighty impact“强有力的影响”对应文中powerful influence“强大的影响”，universe“宇宙”对应space“宇宙空间”，且由第二句可知暗物质的引力将整个星系连接在一起，所以我们才能感知到暗物质的存在，故选项B正确。
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