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  2. Milky Way - Wikipedia

    en.wikipedia.org/wiki/Milky_Way

    The Milky Way is approximately 890 billion to ... astronomers reported that the virial mass of the Milky Way Galaxy is 1.54 ... About 13.5 billion-years-old, ...

  3. Galactic year - Wikipedia

    en.wikipedia.org/wiki/Galactic_year

    The galactic year, also known as a cosmic year, is the duration of time required for the Sun to orbit once around the center of the Milky Way Galaxy. One galactic year is approximately 225 million Earth years.

  4. Timeline of knowledge about galaxies, clusters of galaxies ...

    en.wikipedia.org/wiki/Timeline_of_knowledge...

    1995 — First detection of small-scale structure in the cosmic microwave background. 1995 — Hubble Deep Field survey of galaxies in field 144 arc seconds across. 1998 — The 2dF Galaxy Redshift Survey maps the large-scale structure in a section of the Universe close to the Milky Way. 1998 — The Hubble Deep Field South is compiled.

  5. Scientists identify Milky Way's ancient building blocks ... - AOL

    www.aol.com/news/scientists-identify-milky-ways...

    The Milky Way is a large spiral-shaped galaxy populated by hundreds of billions of stars whose disk measures approximately 100,000 light years in diameter. ... they called the "poor old heart" of ...

  6. Earliest building blocks of the Milky Way discovered near its ...

    www.aol.com/galactic-archaeology-reveals-two...

    The stars in our galaxy’s heart are metal-poor, so we dubbed this region the Milky Way’s ‘poor old heart,’” said Rix, director of the Max Planck Institute for Astronomy’s department of ...

  7. 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.

  8. Laniakea Supercluster - Wikipedia

    en.wikipedia.org/wiki/Laniakea_Supercluster

    The Laniakea Supercluster ( / ˌlɑːni.əˈkeɪ.ə /; Hawaiian for "open skies" or "immense heaven") [2] is the galaxy supercluster that is home to the Milky Way and approximately 100,000 other nearby galaxies. It was defined in September 2014, when a group of astronomers including R. Brent Tully of the University of Hawaiʻi, Hélène ...

  9. Galaxy - Wikipedia

    en.wikipedia.org/wiki/Galaxy

    The Milky Way galaxy is a member of an association named the Local Group, a relatively small group of galaxies that has a diameter of approximately one megaparsec. The Milky Way and the Andromeda Galaxy are the two brightest galaxies within the group; many of the other member galaxies are dwarf companions of these two. [217]

  10. Large Magellanic Cloud - Wikipedia

    en.wikipedia.org/wiki/Large_Magellanic_Cloud

    Based on the D 25 isophote at the B-band (445 nm wavelength of light), the Large Magellanic Cloud is about 9.86 kiloparsecs (32,200 light-years) across. [1] [4] It is roughly one-hundredth the mass of the Milky Way [11] and is the fourth-largest galaxy in the Local Group, after the Andromeda Galaxy (M31), the Milky Way, and the Triangulum ...

  11. Galactic astronomy - Wikipedia

    en.wikipedia.org/wiki/Galactic_astronomy

    Galactic astronomy. Galactic astronomy is the study of the Milky Way galaxy and all its contents. This is in contrast to extragalactic astronomy, which is the study of everything outside our galaxy, including all other galaxies. Galactic astronomy should not be confused with galaxy formation and evolution, which is the general study of galaxies ...