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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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  • 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), literally 'milky', a reference to the Milky Way galaxy that contains the Solar System
  • 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
  • Definition, Formation, Types, Properties, Facts - Britannica
    Galaxies differ from one another in shape, with variations resulting from the way in which the systems were formed and subsequently evolved Galaxies are extremely varied not only in structure but also in the amount of activity observed
  • What Is a Galaxy? | NASA Space Place – NASA Science for Kids
    There are many galaxies besides ours, though There are so many, we can’t even count them all yet! 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
  • Galaxies: Collisions, Types and How Theyre Made | Space
    Galaxies are composed of stars, dust and dark matter, all held together by gravity Astronomers aren't certain exactly how galaxies formed After the Big Bang, space was made up almost entirely
  • Galaxies - Imagine the Universe!
    Galaxies can be found by themselves, in small groups and in large clusters It is very rare to find stars in the space in between galaxies Galaxies sometimes collide with each other, with interesting results These collisions can trigger bursts of star-formation in addition to changing the shapes of the galaxies that collide
  • What’s a galaxy? All you need to know - EarthSky
    Galaxies are the building blocks of our universe Their distribution isn’t random, as one might suppose Instead, galaxies reside along unimaginably long filaments across the universe, forming
  • 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
  • What is a galaxy? - Live Science
    Galaxies are groups of stars and other space objects held together by gravity There are more than 100 billion galaxies in the universe, each presenting beautiful structures that can be seen in
  • Galaxy Facts - Interesting Facts about Galaxies - Space Facts
    There are probably more than 170 billion galaxies in the observable universe Astronomers sort galaxies into three main types by their shapes: spirals, ellipticals, and irregulars, and further divide them into subtypes based on their particular characteristics Find out more about one of the galaxies by selecting it below





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