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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), meaning '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
  • Galaxy | Definition, Formation, Types, Properties, Facts | Britannica
    The existence of galaxies was not recognized until the early 20th century Since then, however, galaxies have become one of the focal points of astronomical investigation The notable developments and achievements in the study of galaxies are surveyed here
  • 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
  • What is a Galaxy? - sciencenewstoday. org
    Galaxies are the cosmic environments where stars ignite, planets form, and the elements necessary for life are forged Every atom in your body—carbon, oxygen, calcium, iron—was created in the hearts of stars within ancient galaxies
  • UNIVERSE MAP
    Explore our cosmic neighborhood in an interactive 3D map featuring the Milky Way, Andromeda, Triangulum, and dozens of nearby dwarf galaxies Built for curious learners, stargazers, and astronomy enthusiasts who want a clean, guided way to understand how nearby galaxies relate in space
  • Galaxies | Latest Developments in Galaxy Formation and Evolution
    With more than 100 billion galaxies in the observable universe, the exciting discoveries and unanswered questions are endless Each one is unique, from ellipticals that have quenched their star formation to the vast and breathtakingly beautiful spiral galaxies imaged in so many galaxy pictures
  • What’s a galaxy? All you need to know about galaxies - EarthSky
    Typically, galaxies are millions of light-years apart Galaxies are the building blocks of our universe Their distribution isn’t random, as one might suppose Instead, galaxies reside along
  • 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
  • 13: Galaxies - Physics LibreTexts
    This page explains that galaxies are vast systems made up of stars, remnants, interstellar medium, and dark matter, named after the Greek word for milk There are approximately 170 billion galaxies in the Universe, many likely hosting planets around stars





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