GRE阅读材料：银河系边远物质是暗的

-本文为网络收集精选范文、公文、论文、和其他应用文档，如需本文，请下载-GRE阅读材料：银河系边远物质是暗的本文从网络收集而来，上传到平台为了帮到更多的人，如果您需要使用本文档，请点击下载按钮下载本文档（有偿下载），另外祝您生活愉快，工作顺利，万事如意！为了帮助考生们更好地备考GRE，出国留学网GRE栏目为大家带来“GRE阅读材料：银河系边远物质是暗的”，希望对大家有所帮助哦!It is now established that the Milky Way is far more extended and of much greater mass than was hitherto thought.However, all that is visible of the constituents of the Milky Ways corona (outer edge), where much of the galaxys mass must be located, is a tiny fraction of the coronas mass.Thus, most of the Milky Ways outlying matter must be dark.Why? Three facts are salient. First, dwarf galaxies and globular clusters, into which most of the stars of theMilky Ways corona are probably bound, consist mainly of old stars.Second, old stars are not highly luminous.Third, no one has detected in the corona the clouds of gaseous matter such as hydrogen and carbon monoxide that are characteristic of the bright parts of a galaxy.10. The passage as a whole is primarily concerned with(A) analyzing a current debate(B) criticizing a well-established theory(C) showing how new facts support a previously dismissed hypothesis(D) stating a conclusion and adducing evidence that may justify it(E) contrasting two types of phenomena and showing how they are related11. Select the sentence that the author implicitly indicates what astronomers believed about the Milky Way until fairly recently.GRE阅读栏目推荐：GRE经济类双语阅读精选GRE双语阅读之德国实施割礼须征求孩子意见新GRE阅读长难句中英互译精选解析GRE阅读的主题层面和细节层面本文从网络收集而来，上传到平台为了帮到更多的人，如果您需要使用本