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  2. Abundance of the chemical elements - Wikipedia

    en.wikipedia.org/wiki/Abundance_of_the_chemical...

    The abundance of the chemical elements is a measure of the occurrence of the chemical elements relative to all other elements in a given environment. Abundance is measured in one of three ways: by mass fraction (in commercial contexts often called weight fraction ), by mole fraction (fraction of atoms by numerical count, or sometimes fraction ...

  3. Perseus Arm - Wikipedia

    en.wikipedia.org/wiki/Perseus_Arm

    The Perseus Arm is one of two major spiral arms of the Milky Way galaxy. The second major arm is called the Scutum–Centaurus Arm. The Perseus Arm begins from the distal end of the long Milky Way central bar. [1] Previously thought to be 13,000 light-years away, it is now thought to lie 6,400 light years from the Solar System.

  4. Portal:Solar System - Wikipedia

    en.wikipedia.org/wiki/Portal:Solar_System

    The outermost region of the Solar System is the theorized Oort cloud, the source for long-period comets, extending to a radius of 2,000–200,000 astronomical units (0.032–3.2 light-years). The closest star to the Solar System, Proxima Centauri, is 4.25 light-years (269,000 AU) away. Both stars belong to the Milky Way galaxy.

  5. Galactic Center - Wikipedia

    en.wikipedia.org/wiki/Galactic_Center

    Galactic Center. 17 45 40.04, −29° 00′ 28.1″. The Galactic Center, as seen by one of the 2MASS infrared telescopes, is located in the bright upper left portion of the image. Marked location of the Galactic Center. The Galactic Center is the barycenter of the Milky Way and a corresponding point on the rotational axis of the galaxy.

  6. List of largest stars - Wikipedia

    en.wikipedia.org/wiki/List_of_largest_stars

    List of the largest known stars in the Milky Way Star name Solar radii (Sun = 1) Method Notes Orbit of Saturn: 2,047 – 2,049.9: Reported for reference: WOH G64 (For comparison) 1,540 ± 77: L/T eff: Located in the Large Magellanic Cloud. Possibly the largest known star. Theoretical limit of star size (Milky Way)

  7. Andromeda–Milky Way collision - Wikipedia

    en.wikipedia.org/wiki/Andromeda–Milky_Way...

    The Andromeda–Milky Way collision is a galactic collision predicted to occur in about 4.5 billion years between the two largest galaxies in the Local Group—the Milky Way (which contains the Solar System and Earth) and the Andromeda Galaxy.

  8. Virgo Supercluster - Wikipedia

    en.wikipedia.org/wiki/Virgo_Supercluster

    Virgo Supercluster. The Virgo Supercluster ( Virgo SC) or the Local Supercluster ( LSC or LS) was a formerly defined supercluster containing the Virgo Cluster and Local Group, which itself contains the Milky Way and Andromeda galaxies, as well as others. At least 100 galaxy groups and clusters are located within its diameter of 33 megaparsecs ...

  9. Galactic quadrant - Wikipedia

    en.wikipedia.org/wiki/Galactic_quadrant

    Galactic quadrant. Longitudinal lines of the galactic coordinate system. A galactic quadrant, or quadrant of the Galaxy, is one of four circular sectors in the division of the Milky Way Galaxy. Numbered quadrants and sectors of constellations. Quadrants as starcharts, with most prominent stars marked.