Galaxy groups and clusters are the largest gravitationally-bound objects to have arisen thus far in the process of cosmic structure formation. They form the densest part of the ...

Galaxy Clusters and Large-Scale Structure Groups and clusters of galaxies. Galaxies are preferentially found in groups or larger agglomerations called clusters.

Overview of X-ray Astronomy and X-ray sources: black holes to galaxy clusters.

click on asterisk to see special notes on individual clusters

An explanation of cosmic X-ray sources, from black holes to galaxy clusters, as well as a review of the history of X-ray astronomy, what X-rays are and how they are produced.

Groups and Clusters of Galaxies Click icon for an index of galaxy groups and clusters containing galaxies of Messier's catalog Our icon shows a region near the center of the Virgo ...

Gene Smith's Astronomy Tutorial - Clusters of Galaxies ... Most galaxies are found in gravitationally-bound groups called "clusters".

Groups and clusters of galaxies; List of nearest galaxies; List of galaxy clusters; Local Supercluster; Andromeda's satellite galaxies; Milky Way's satellite galaxies

The scientists at Goddard Space Flight Center are studying many different things about galaxy clusters, but these can be divided into two main groups:

Observing Galaxy Clusters The eternal silence of these infinite spaces terrifies me - Pascal. Observing galaxy clusters is a way of looking directly into the unimaginable depths of ...

In fact, the Hercules Cluster itself may be seen as the result of ongoing mergers of smaller galaxy clusters and is thought to be similar to young galaxy clusters in the much more ...

This site is intended for students age 14 and up, and for anyone interested in learning about our universe.

8/27/2008 STScI-2008-32 1. A Clash of Clusters Provides New Clue to Dark Matter A powerful collision of galaxy clusters has been captured by NASA?s Hubble Space Telescope and ...

Space.com explains galaxies, colliding galaxies, cluster of galaxies, pictures galaxies and science astronomy galaxies

Astronomical Data Center. ADC Quick Reference Page:-- BASIC DATA ON GALAXY GROUPS & CLUSTERS --How to use this Page. This page contains links to data pertaining to the following ...

Single Cluster Simulations The simulations in this section were created with the Advanced Visual Systems (AVS) software package. Please note: you are welcome to use any of the ...

Astronomers have found what they are calling the perfect cosmic storm, a galaxy cluster pile-up so powerful it's energy output is second only to the Big Bang, researchers said.

Near the cluster center, roughly 250 million light-years away, is the cluster's dominant galaxy NGC 1275, seen here just left of picture center.

Dwarf Irregulars and Galaxy Clusters. Galaxies were once viewed as immutable objects, persisting in their present form for ...

X-ray surface brightness contours from an image of the Coma cluster made with ROSAT (White et al. 1993). Significant substructure is evident, probably due to recent mergers.

... the central portion of the Virgo Cluster of Galaxies, and is centered on the giant elliptical galaxy M87 which is considered to be the dominant galaxy of the whole giant cluster ...

Galaxy, Photography, Images by Jason Ware ... Omega Centauri #DP012: Omega Over TSP #DP032: M6 Starfield #DP005: M15 Cluster #DP031

By measuring the velocities of hundreds of clusters of galaxies distributed across the entire sky, scientists have discovered a bulk flow of over a million mph in the direction of ...

Galaxies are often found in groups called clusters of galaxies. Clusters with few members (tens or so) are called "poor" and clusters with many members (hundreds or more) are ...

Cosmology - Galaxy Clusters ... Cosmology - Galaxy Clusters: Galaxies are never found alone. They are all a part of a local group which is then a part of a cluster of ...

8/27/2008 STScI-2008-32 3. A Clash of Clusters Provides New Clue to Dark Matter A powerful collision of galaxy clusters has been captured by NASA?s Hubble Space Telescope and Chandra ...

Galaxy Clusters. Nearly all galaxies, including our own can be found in groups, or galaxy clusters. The following pictures are of galaxy clusters.

An orbiting observatory has spotted a massive cluster of galaxies in deep space that can only be explained by the exotic phenomenon known as dark energy, the European Space Agency ...

Galaxy Clusters represent probably the largest structures in the Universe where gravity has won, where the density of galaxies and other matter is so large that the expansion of ...

A study of nearby galaxy clusters has cast doubt on the entire Big Bang theory, but other experts have serious misgivings about the results.