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  • Galaxies - NASA Science
    Galaxies consist of stars, planets, and vast clouds of gas and dust, all bound together by gravity The largest contain trillions of stars and can be more than a million light-years across The smallest can contain a few thousand stars and span just a few hundred light-years
  • Galaxy - Wikipedia
    A galaxy is a system of stars, stellar remnants, interstellar gas, dust, and dark matter bound together by gravity [1][2] The word is derived from the Greek galaxias (γαλαξίας), meaning 'milky', a reference to the Milky Way galaxy that contains the Solar System
  • Galaxies News -- ScienceDaily
    News and research on the formation of galaxies From the Milky Way to Andromeda Galaxy, see astronomy images of splendid galaxies in the universe Read the latest research discoveries
  • Galaxies—facts and information | National Geographic
    Galaxies are sprawling systems of dust, gas, dark matter, and anywhere from a million to a trillion stars that are held together by gravity Nearly all large galaxies are thought to also
  • Galaxies - WorldAtlas
    Thus, we can define a galaxy as an astronomical object that contains millions to billions of stars from multiple generations, all of which are bound by gravity Less than a century ago, our view of the universe was radically different than it is today
  • ViewSpace
    ViewSpace gives you the opportunity to explore our planet, solar system, galaxy, and universe Provided free with the support of NASA, ViewSpace is developed by a team of scientists, educators, and communication specialists who collaborate to ensure that content is accurate, up-to-date, engaging, relevant, and accessible to a wide audience Interactives ViewSpace interactives allow you to
  • Galaxy - ESA Hubble
    Galaxies are collections of stars, dust, gas, and dark matter, which are bound together by the gravitational attraction that results from their own mass A small dwarf galaxy contains a few million stars, whilst the biggest known galaxies can contain up to a hundred trillion stars
  • How galaxies form: Theories, variants and growth | Space
    Here are some of the most promising theories of how galaxies form, how and why they merge, as well as the different varieties of galaxies that have been observed As the universe expanded in
  • Galaxies - Celestial Objects on Sea and Sky
    Galaxies are defined as large groupings of stars, dust, and gas held together by gravity They vary greatly in size and shape Most of the objects we know of in space are contained within galaxies They contain stars, planets, moons, comets, asteroids, nebulae, dust, neutron stars, and black holes
  • What Is a Galaxy? | NASA Space Place – NASA Science for Kids
    Some galaxies are spiral-shaped like ours They have curved arms that make it look like a pinwheel Other galaxies are smooth and oval shaped They’re called elliptical galaxies And there are also galaxies that aren’t spirals or ovals They have irregular shapes and look like blobs





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