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  2. Galaxy morphological classification - Wikipedia

    en.wikipedia.org/wiki/Galaxy_morphological...

    Galaxy morphological classification is a system used by astronomers to divide galaxies into groups based on their visual appearance. There are several schemes in use by which galaxies can be classified according to their morphologies, the most famous being the Hubble sequence , devised by Edwin Hubble and later expanded by Gérard de ...

  3. Outline of galaxies - Wikipedia

    en.wikipedia.org/wiki/Outline_of_galaxies

    The word galaxy is derived from the Greek galaxias (γαλαξίας), literally "milky", a reference to the Milky Way. Galaxies range in size from dwarfs with just a few billion (109) stars to giants with one hundred trillion (1014) stars, each orbiting its galaxy's center of mass.

  4. Outline of astronomy - Wikipedia

    en.wikipedia.org/wiki/Outline_of_astronomy

    Galactic astronomy – deals with the structure and components of our Galaxy and of other galaxies. High energy astrophysics – studies phenomena occurring at high energies including active galactic nuclei, supernovae, gamma-ray bursts, quasars, and shocks. Interstellar astrophysics – study of the interstellar medium, intergalactic medium ...

  5. List of galaxies - Wikipedia

    en.wikipedia.org/wiki/List_of_galaxies

    Galaxy (aka HIPASS J1131-31) was hidden behind a relatively fast-moving foreground star (TYC 7215-199-1) and became observable when the star moved aside. [citation needed] Galaxy, relatively nearby, is considered one of the most metal-poor ("extremely metal-poor" (XMP)), least chemically enriched, and seemingly primordial, galaxies known. [10] [11]

  6. Lists of astronomical objects - Wikipedia

    en.wikipedia.org/wiki/Lists_of_astronomical_objects

    Lists of galaxies. List of galaxies; List of largest galaxies; List of galaxies with richest globular cluster systems; List of nearest galaxies; List of galaxies named after people

  7. List of largest galaxies - Wikipedia

    en.wikipedia.org/wiki/List_of_largest_galaxies

    Listed below are galaxies with diameters greater than 700,000 light-years. This list uses the mean cosmological parameters of the Lambda-CDM model based on results from the 2015 Planck collaboration, where H 0 = 67.74 km/s/Mpc, Ω Λ = 0.6911, and Ω m = 0.3089. [3]

  8. Galaxy - Wikipedia

    en.wikipedia.org/wiki/Galaxy

    A galaxy is a system of stars, stellar remnants, interstellar gas, dust, and dark matter bound together by gravity. [1] [2] The word is derived from the Greek ...

  9. Location of Earth - Wikipedia

    en.wikipedia.org/wiki/Location_of_Earth

    Milky Way Galaxy: 30,000 pc 9.26×10 17: Our home galaxy, composed of 200 billion to 400 billion stars and filled with the interstellar medium. [36] [37] Milky Way subgroup: 840,500 pc 2.59×10 19: The Milky Way and those satellite dwarf galaxies gravitationally bound to it. Examples include the Sagittarius Dwarf, the Ursa Minor Dwarf and the ...