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  2. 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. [1] One galactic year is approximately 225 million Earth years. [2]

  3. Galaxy - Wikipedia

    en.wikipedia.org/wiki/Galaxy

    A "normal" radio galaxy do not have a source that is a supermassive black hole or monster neutron star; instead the source is synchrotron radiation from relativistic electrons accelerated by supernova. These sources are comparatively short lived, making the radio spectrum from normal radio galaxies an especially good way to study star formation.

  4. Future of an expanding universe - Wikipedia

    en.wikipedia.org/wiki/Future_of_an_expanding...

    3.1.1 Milky Way Galaxy and the Andromeda Galaxy merge into ... to undetectably long wavelengths and low energies ... This page was last edited on 26 January 2025, ...

  5. Ultimate fate of the universe - Wikipedia

    en.wikipedia.org/wiki/Ultimate_fate_of_the_universe

    The angles of a triangle sum to less than 180 degrees, and lines that do not meet are never equidistant; they have a point of least distance and otherwise grow apart. The geometry of such a universe is hyperbolic. [11] Even without dark energy, a negatively curved universe expands forever, with gravity negligibly slowing the rate of expansion.

  6. Milky Way - Wikipedia

    en.wikipedia.org/wiki/Milky_Way

    The Milky Way [c] is the galaxy that includes the Solar System, with the name describing the galaxy's appearance from Earth: a hazy band of light seen in the night sky formed from stars in other arms of the galaxy, which are so far away that they cannot be individually distinguished by the naked eye.

  7. Andromeda–Milky Way collision - Wikipedia

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

    Such collisions are relatively common, considering galaxies' long lifespans. Andromeda, for example, is believed to have collided with at least one other galaxy in the past, [11] and several dwarf galaxies such as Sgr dSph are currently colliding with the Milky Way and being merged into it.

  8. Chronology of the universe - Wikipedia

    en.wikipedia.org/wiki/Chronology_of_the_universe

    From 1 billion years, and for about 12.8 billion years, the universe has looked much as it does today and it will continue to appear very similar for many billions of years into the future. The thin disk of our galaxy began to form when the universe was about 5 billion years old or 9 ± 2 Gya. [15]

  9. Age of the universe - Wikipedia

    en.wikipedia.org/wiki/Age_of_the_universe

    After testing, they became certain that the signal did not come from the Earth, the Sun, or the Milky Way galaxy, ... This page was last edited on 3 March 2025, ...

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