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  2. Andromeda–Milky Way collision - Wikipedia

    en.wikipedia.org/wiki/AndromedaMilky_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.

  3. Milky Way - Wikipedia

    en.wikipedia.org/wiki/Milky_Way

    The Milky Way is approximately 890 billion to 1.54 trillion times the mass of the Sun in total (8.9 × 10 11 to 1.54 × 10 12 solar masses), [7] [8] [9] although stars and planets make up only a small part of this. Estimates of the mass of the Milky Way vary, depending upon the method and data used.

  4. Andromeda Galaxy - Wikipedia

    en.wikipedia.org/wiki/Andromeda_Galaxy

    However, this has been called into question by early-21st-century studies indicating a possibly lower mass for the Andromeda Galaxy [11] and a higher mass for the Milky Way. [ 12 ] [ 13 ] The Andromeda Galaxy has a diameter of about 46.56 kpc (152,000 ly), making it the largest member of the Local Group of galaxies in terms of extension.

  5. Local Group - Wikipedia

    en.wikipedia.org/wiki/Local_Group

    The term "The Local Group" was introduced by Edwin Hubble in Chapter VI of his 1936 book The Realm of the Nebulae. [11] There, he described it as "a typical small group of nebulae which is isolated in the general field" and delineated, by decreasing luminosity, its members to be M31, Milky Way, M33, Large Magellanic Cloud, Small Magellanic Cloud, M32, NGC 205, NGC 6822, NGC 185, IC 1613 and ...

  6. Virgo Supercluster - Wikipedia

    en.wikipedia.org/wiki/Virgo_Supercluster

    [13] [14] By comparison, the mass-to-light ratio for the Milky Way is 63.8 assuming a solar absolute magnitude of 4.83, [15] a Milky Way absolute magnitude of −20.9, [16] and a Milky Way mass of 1.25 × 10 12 M ☉. [17]

  7. Velocity dispersion - Wikipedia

    en.wikipedia.org/wiki/Velocity_dispersion

    For example, the σ found for objects about the Milky Way's supermassive black hole (SMBH) is about 100 km/s, which provides an approximation of the mass of this SMBH. [2] The Andromeda Galaxy (Messier 31) hosts a SMBH about 10 times larger than our own, and has a σ ≈ 160 km/s. [3]

  8. Galaxy rotation curve - Wikipedia

    en.wikipedia.org/wiki/Galaxy_rotation_curve

    The mass estimations for galaxies based on the light they emit are far too low to explain the velocity observations. [3] The galaxy rotation problem is the discrepancy between observed galaxy rotation curves and the theoretical prediction, assuming a centrally dominated mass associated with the observed luminous material.

  9. Triangulum Galaxy - Wikipedia

    en.wikipedia.org/wiki/Triangulum_Galaxy

    Triangulum may be home to 40 billion stars, compared to 400 billion for the Milky Way and 1 trillion for Andromeda. [6] The disk of Triangulum has an estimated mass of (3–6) × 10 9 solar masses, while the gas component is about 3.2 × 10 9 solar masses. Thus, the combined mass of all baryonic matter in the galaxy may be 10 10 solar masses.