the galaxies

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Galaxies - Free Online Picture Dictionary

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Freely usable Galaxies photos

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Galaxies information and links

  • The word galaxy is derived from the Greek galaxias -language text">γαλαξίας), literally"milky", a reference to the Milky Way.
  • Galaxies range in size from dwarfs with just a few hundred million stars to giants with one hundred trillion stars, each orbiting its galaxy's center of mass.
  • Galaxies are categorized according to their visual morphology as elliptical, spiral, or irregular.
  • The Milky Way's central black hole, known as Sagittarius A*, has a mass four million times greater than the Sun.
  • As of March 2016, GN-z11 is the oldest and most distant galaxy observed.
  • In 2021, data from NASA's New Horizons space probe was used to revise the previous estimate of 2 trillion Galaxies down to roughly 200 billion Galaxies .
  • Most of the Galaxies are 1,000 to 100,000 parsecs in diameter and are separated by distances on the order of millions of parsecs .
  • The majority of Galaxies are gravitationally organized into groups, clusters, and superclusters.
  • The Milky Way is part of the Local Group, which it dominates along with Andromeda Galaxy.