OTTAWA, April 14 (Xinhua) -- A composite image of a dark matter web, which is believed to connect galaxies, was captured for the first time by Canadian researchers.
The false color image, published in Monthly Notices of the Royal Astronomical Society on Wednesday, shows two galaxies, in white, connected by a bridge of dark matter in the red region. The two galaxies are about 40 light years apart.
"For decades, researchers have been predicting the existence of dark-matter filaments between galaxies that act like a web-like superstructure connecting galaxies together," said Mike Hudson, professor of astronomy at the University of Waterloo, in a statement on the university website.
"This image moves us beyond predictions to something we can see and measure," he said in the statement.
Dark matter, which makes up an estimated 25 percent of the universe, can not be directly observed because it does not shine, reflect or interact with light, but its existence and properties are inferred from its gravitational effects such as the motions of visible matter.
By using weak gravitational lensing, Hudson and his co-author Seth Epps measured the effect that dark matter has on light and created a composite image showing the presence of the mysterious substance.
The technique not only enables us to see the existence of dark-matter filaments in the universe, but to observe the extent to which these filaments connect galaxies, Epps said.
2017高考英语一轮语法对点讲练:4 情态动词和虚拟语气
国内英语资讯:Chinese state councilor meets Namibian deputy PM
国内英语资讯:More than 20,000 Japanese enterprises invest in China
体坛英语资讯:Atletico and Real Madrid prepare for Wednesdays Champions League clashes
2017届高考英语一轮复习单元提升:选修10 Unit 3、4(译林版)
2017届高考英语一轮复习单元提升:选修6 Unit 2 What is happiness to you(译林版)
2017届高考英语(课标全国)一轮复习课件:写作提升 第12讲
国内英语资讯:China plans planting areas to upgrade agricultural pattern
国际英语资讯:G-7 ministers conclude Rome energy summit without statement on climate change after U.S. opp
2017届高考英语一轮复习单元提升:选修8 Unit 2 The universal language(译林版)
2017届高考英语(课标全国)一轮复习课件:语法突破 第1讲(冠词)
2017高考英语一轮语法对点讲练:9 状语从句
国际英语资讯:Spotlight: Explosions hit Dortmund teams bus, one player injured
2017届高考英语(课标全国)一轮复习课件:写作提升 第11讲
2017届高考英语(课标全国)一轮复习课件:写作提升 第2讲
2017高考英语一轮语法对点讲练:11 形容词、副词
2017届高考英语(课标全国)一轮复习课件:写作提升 第6讲
国际英语资讯:News Analysis: Trumps infrastructure plan expected to boost U.S. jobs, but with downsides
2017年高考英语语法复习专题巧突破 第二部分 专项专练: 三大从句(含详解,含押题)
国内英语资讯:About 18,000 convicted for IP piracy, counterfeiting in China
体坛英语资讯:Tony Adams appointed as new Granada coach
2017高考英语一轮语法对点讲练:7 非谓语动词
2017高考英语一轮语法对点讲练:2 定语从句
国际英语资讯:Germanys Dortmund cancels Champions League match after explosions
2017届高考英语(课标全国)一轮复习课件:写作提升 第9讲
2017届高考英语(课标全国)一轮复习课件:写作提升 第13讲
2017高考英语一轮语法对点讲练:8 特殊句式
2017届高考英语(课标全国)一轮复习课件:写作提升 第7讲
2017届高考英语(课标全国)一轮复习课件:语法突破 第2讲
2017届高考英语(课标全国)一轮复习课件:写作提升 第4讲
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |