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galaxies    音标拼音: [g'æləksiz]
Galaxy \Gal"ax*y\, n.; pl. {Galaxies}. [F. galaxie, L. galaxias,
fr. Gr. ? (sc. ? circle), fr. ?, ?, milk; akin to L. lac. Cf.
{Lacteal}.]
[1913 Webster]
1. (Astron.)

1. The Milky Way, that luminous tract, or belt, which is seen
at night stretching across the heavens, and which is
composed of innumerable stars, so distant and blended as
to be distinguishable only with the telescope. --Nichol.
[1913 Webster]

2. A very large collection of stars comparable in size to the
Milky Way system, held together by gravitational force and
separated from other such star systems by large distances
of mostly empty space. Galaxies vary widely in shape and
size, the most common nearby galaxies being over 70,000
light years in diameter and separated from each other by
even larger distances. The number of stars in one galaxy
varies, and may extend into the hundreds of billions.
[PJC]

3. A splendid or impressive assemblage of persons or things;
as, a galaxy of movie stars.
[1913 Webster PJC] Galban



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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
    Galaxies, averaging an estimated 100 million stars, [3] range in size from dwarfs with less than a thousand stars [4] to the largest galaxies known — supergiants with one hundred trillion stars, each orbiting its galaxy's center of mass
  • List of galaxies - Wikipedia
    This is a list of galaxies that are visible to the naked eye, for at the very least, keen-eyed observers in a very dark-sky environment that is high in altitude, during clear and stable weather
  • Galaxy | Definition, Formation, Types, Properties, Facts | Britannica
    galaxy, any of the systems of stars and interstellar matter that make up the universe Many such assemblages are so enormous that they contain hundreds of billions of stars Nature has provided an immensely varied array of galaxies, ranging from faint, diffuse dwarf objects to brilliant spiral-shaped giants
  • What Is a Galaxy—and How Many Are There in the Universe?
    Discover what a galaxy is explained in simple terms, how many galaxies exist, and how the universe size shapes our view of the cosmos—packed with clear, engaging science
  • Types - NASA Science
    Our Milky Way is one example of a broad class of galaxies defined by the presence of spiral arms These galaxies resemble giant rotating pinwheels with a pancake-like disk of stars and a central bulge or tight concentration of stars
  • What Is a Galaxy? | NASA Space Place – NASA Science for Kids
    The Hubble Space Telescope looked at a small patch of space for 12 days and found 10,000 galaxies, of all sizes, shapes, and colors Some scientists think there could be as many as one hundred billion galaxies in the universe
  • 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 contain
  • Types Of Galaxies In Our Universe! - YouTube
    These galaxies vary in size, shape and the amount of gas and stars in them Some of these galaxies can be thousands of lightyears across and its almost a certainty that there is another
  • What is a galaxy? - earth. com
    Galaxies fall into three broad categories based on shape: spiral, elliptical, and irregular Astronomer Edwin Hubble first laid out this classification scheme in 1926





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