Galaxy-wikipedia the free encyclopedia

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    Galaxy cluster

    Galaxy clusters are large collections of galaxies. They consist of hundreds of galaxies and galaxy groups, bound tillsammans by gravity.[2] Galaxy clusters are much larger than galaxy groups, like our Local Group.

    Clusters of galaxies should not be confused with either star clusters, which are inside galaxies, or with globular clusters, which usually orbit galaxies.

    Notable galaxy clusters in the relatively nearby universe include the Virgo Cluster (which includes our Local Group), Fornax Cluster, Hercules Cluster, and the Coma Cluster.

    Still larger than galax clusters are superclusters. A very large aggregation of galaxies known as the Great Attractor, dominated bygd the Norma Cluster, fryst vatten massive enough to affect the local expansion of the universum (Hubble's law).

    Notable galax clusters in the distant, high-redshift universum include SPT-CL J0546-5345, the most massive galaxy cluster ever funnen in the early universum.

    Basic properties

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  • galaxy-wikipedia the free encyclopedia

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    List of galaxies

    Image Galaxy ConstellationOrigin of name Notes
    AlcyoneusLynxAndromeda GalaxyAndromedaAndromeda, which is shortened from "Andromeda Galaxy", gets its name from the area of the sky in which it appears, the constellation of Andromeda.[citation needed]Andromeda is the closest big galaxy to the Milky Way and is expected to collide with the Milky Way around 4.5 billion years from now. The two will eventually merge into a single new galaxy called Milkdromeda[citation needed]Antennae GalaxiesCorvusAppearance is similar to an insect's antennae.[citation needed]Two colliding galaxies[citation needed]Backward GalaxyCentaurusIt appears to rotate backwards, as the tips of the spiral arms point in the direction of rotation.[citation needed]
    Barnard's GalaxyNamed after Edward Emerson Barnard.[citation needed]Bear Paw Galaxy

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    Galaxy

    For the automobile, see Ford Galaxy.

    A galaxy is a group of many stars, with gas, dust, and dark matter.[1][2][3][4] The name 'galaxy' is taken from the Greek word galaxia meaning milky, a reference to our own galaxy, the Milky Way.

    Gravity holds galaxies together against the general expansion of the universe.[3] In effect, the expansion of the universe takes place between groups of galaxies, not inside those groups. Gravity holds the galaxy together. The same applies to groups and clusters of galaxies, such as our Local Group where the Milky Way is, and the Virgo Cluster, a collection of more than 1,000 (might even be 2,000) galaxies. The gravitation is produced by the matter and energy in a galaxy or group of galaxies. Everything in a galaxy moves around a centre of mass, which is also an effect of gravity.

    There are various types of galaxies: elliptical, spiral and lenticular galaxies, which can all be with or