Galaxy groups and clusters
hideGalaxy groups and clusters are the largest known gravitationally bound objects to have arisen thus far in the process of cosmic structure formation. They form the densest part of the large scale structure of the universe. In models for the gravitational formation of structure with cold dark matter, the smallest structures collapse first and eventually build the largest structures, clusters of galaxies. Clusters are then formed relatively recently between 10 billion years ago and now. Groups and clusters may contain from ten to thousands of galaxies. The clusters themselves are often associated with larger groups called superclusters.
For more information about Galaxy groups and clusters, read the full article at
Wikipedia.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
News tagged with galaxy cluster
Shedding Light on the Cosmic Skeleton
Nov 03, 2009 |
4.8 / 5 (22) |
7
(PhysOrg.com) -- Astronomers have tracked down a gigantic, previously unknown assembly of galaxies located almost seven billion light-years away from us. The discovery, made possible by combining two of the ...
Galaxy cluster smashes distance record
Oct 22, 2009 |
4.2 / 5 (10) |
2
The most distant galaxy cluster yet has been discovered by combining data from NASA's Chandra X-ray Observatory and optical and infrared telescopes. The cluster is located about 10.2 billion light years away, ...
The hunt for dark matter
Sep 17, 2009 |
3.9 / 5 (9) |
10
(PhysOrg.com) -- In a basement laboratory at MIT, assistant professor of physics Jocelyn Monroe is making some final adjustments to her team's newest particle detector. In just a few months, the detector will ...
Researchers explain the activity of black holes at the centre of galaxy clusters
Sep 04, 2009 |
3.9 / 5 (15) |
27
(PhysOrg.com) -- Astronomers at the University of Bonn have clarified the connection between black holes at the centre of galaxy clusters and surrounding gas, which serves them as "food". The scientists have ...
Largest ever survey of very distant galaxy clusters completed
Jun 30, 2009 |
4.4 / 5 (8) |
3
An international team of researchers led by a UC Riverside astronomer has completed the largest ever survey designed to find very distant clusters of galaxies.
Suzaku snaps first complete X-ray view of a galaxy cluster
May 28, 2009 |
4.4 / 5 (8) |
3
The joint Japan-U.S. Suzaku mission is providing new insight into how assemblages of thousands of galaxies pull themselves together. For the first time, Suzaku has detected X-ray-emitting gas at a cluster's ...
Giant galaxy Messier 87 finally sized up
May 20, 2009 |
4.5 / 5 (8) |
0
The new observations reveal that Messier 87's halo of stars has been cut short, with a diameter of about a million light-years, significantly smaller than expected, despite being about three times the extent ...
Planck Satellite ready to measure the Big Bang
May 11, 2009 |
4.5 / 5 (8) |
1
(PhysOrg.com) -- The last tests of the Ariane 5 rocket system have been finished and ESA's Planck satellite is sitting ready for launch at the Guiana Space Centre in Kourou. Together with ESA's space telescope ...
Did 'Dark Gulping' Generate Black Holes in Early Universe?
Apr 23, 2009 |
3.6 / 5 (14) |
10
(PhysOrg.com) -- A process called ‘dark gulping’ may solve the mystery of the how supermassive black holes were able to form when the Universe was less than a billion years old.
Hubble provides new evidence for dark matter around small galaxies
Mar 12, 2009 |
4.4 / 5 (15) |
38
Peering into the tumultuous heart of the nearby Perseus galaxy cluster, Hubble discovered a large population of small galaxies that have remained intact while larger galaxies around them are being ripped apart ...
