News Saleb-,Newspapers are usually issued daily or weekly. Breaking News: New evidence for dark matter makes it even more exotic - News Paper, Magazine News weekly, but they also had a magazine format. Newspapers with common interests usually publish news articles and articles about national and international news as well as local news. These include news events and personalities of the political, business and finance, crime, weather, and natural hazards; health and medicine, science, and computers and technology; Sports; and entertainment, community, food and cuisine, apparel and home fashion, and the arts.
A wide range of materials have been published in newspapers. In addition to news,Breaking News: New evidence for dark matter makes it even more exotic - News Paper ,information and opinions expressed above, including weather forecasts; Criticism and reviews Arts (including literature, film, television, theater, art, and architecture) and local services such as a restaurant; obituaries, notices of birth and graduation announcements; Entertainment features such as crossword puzzles, horoscopes, editorial cartoons, jokes, cartoons and comics; Advice column, food, and other columns; and a list of radio and television (program schedule). In the year 2017, newspapers can also provide information about new movies and TV shows available on streaming video services such as Netflix. The newspaper has been classified ad section in which people and businesses can buy a small ad to sell goods or services; In the year 2013, a large increase in internet sites to sell goods, such as Craigslist and eBay have caused ad sales are much less classified for newspapers.Breaking News: New evidence for dark matter makes it even more exotic - News Paper
Since 1983, it has been known mainly because of its annual report and rankings that influence in college and grad school, lies in most fields and subjects. U.s. News World Report is and academic institution is the oldest and most famous in America, [5] and covering the areas of business, law, medicine, engineering, social sciences, education and public affairs, in addition to many other areas. Print Edition] has consistently included in the list of national bestsellers, coupled with online subscriptions. Additional rankings published by U.s. News World Report and includes hospitals,Breaking News: New evidence for dark matter makes it even more exotic - News Paper, medical and specialty cars.
Breaking News: New evidence for dark matter makes it even more exotic - News Paper-News of the United States was founded in 1933 by David Lawrence (1888-1973), which also started the World Report in 1946. The two magazines are covering national and international news separately, but Lawrence combines them into news reports of U.S. in World and 1948 [1] and Later sold the magazine to its employees. Historically, this magazine tends to be a bit more conservative than the two main competitors, Time and Newsweek, and focus more on the story of economic, health, and education. It's also distancing news, entertainment and sports celebrities. [2] an important milestone in the history of the beginning of the magazine is including the introduction of the "Washington Whispers" column in 1934 and the column "News You Can Use" in 1952. [3] [4] in 1958, the circulation of the weekly magazine passed one million and two million in 1973. (wikipedia) Breaking News: New evidence for dark matter makes it even more exotic - News Paper
Galaxy clusters are the largest known structures in the Universe, containing thousands of galaxies and hot gas. But more importantly, they contain the mysterious dark matter, which accounts for 27 percent of all matter and energy. Current models of dark matter predict that galaxy clusters have very dense cores, and those cores contain a very massive galaxy that never moves from the cluster's center.
Abell S1063, a galaxy cluster, was observed by the NASA/ESA Hubble Space Telescope as part of the Frontier Fields programme. The huge mass of the cluster acts as a cosmic magnifying glass and enlarges even more distant galaxies, so they become bright enough for Hubble to see [Credit: NASA, ESA, and J. Lotz (STScI)]
But after studying ten galaxy clusters, David Harvey at EPFL's Laboratory of Astrophysics and his colleagues in France and the UK have discovered that the density is much smaller than predicted, and that the galaxy at the center actually moves.
Every galaxy cluster contains a galaxy that is brighter than the others, aptly named "brightest cluster galaxy" or BCG. Recent evidence from simulations of exotic, non-standard dark matter shows that BCGs actually wobble long after the galaxy cluster has relaxed. This is residual wobbling caused by massive merging of galaxy clusters.
The researchers compared their observations to the predictions from the BAHAMAS suite of cosmological hydro-dynamical simulations finding that the two did not match. According to the Standard Model of dark matter (called "cold dark matter"), this wobbling doesn't exist because the enormous density of dark matter keeps it tightly bound at the center of the galaxy cluster. Therefore, this mismatch suggests the existence of yet-unknown physics that have not been accounted for.
The galaxy clusters that the astronomers studied also act as strong gravitational lenses: they are so massive that they warp spacetime enough to distort light passing through them, like a lens. As a result, they can be used to make a map of dark matter, working out where the center is and then observing how the BCG wobbles around this center.
"We found that that the BCGs 'slosh' around at the bottom of the halos," says David Harvey. "This indicates that, instead of a dense region in the center of the galaxy cluster, there is a much shallower central density—a striking signal of exotic forms of dark matter right at the heart of galaxy clusters." The wobbling also shows that BCGs cannot coincide exactly with the cluster's halo, meaning that certain models of galaxy clusters have to be adjusted.
The scientists will extend their research with larger surveys of galaxy clusters such as Euclid. They hope that this will allow them to confirm their findings, but to also determine if BCG wobbling originates in new fundamental physics or a novel astrophysical phenomenon.
0 komentar:
Post a Comment