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subgroups    音标拼音: [s'ʌbgr,ups]
子组,子集

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英文字典中文字典相关资料:


  • 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
  • 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
  • Galaxy | Definition, Formation, Types, Properties, Facts | Britannica
    A galaxy is 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 Galaxies usually exist in clusters, some of which measure hundreds of millions of light-years across
  • Galaxy – Definition Facts | StellarSnap
    A galaxy is a vast, gravitationally bound system of stars, stellar remnants, gas, dust, and dark matter They range in size from dwarf galaxies with a few thousand stars to giants containing over a trillion stars and spanning more than a million light‑years in diameter
  • What’s a galaxy? All you need to know about galaxies - EarthSky
    A galaxy can contain hundreds of billions of stars and be many thousands of light-years across Our own galaxy, the Milky Way, is around 100,000 light-years in diameter
  • What Is a Galaxy? Facts, Classification and the Milky Ways Place in . . .
    A galaxy is a large group of stars that orbit around a common point, usually a Supermassive Black Hole Some galaxies, such as the dwarf Galaxy called Segue 2, do not have a Supermassive Black Hole but rather orbit a central gravitational point
  • Galaxy - Encyclopedia. com
    A galaxy is a large collection of stars, glowing nebulae (clouds), gas, and dust bound together by gravity Many scientists now believe that a black hole, the remains of a massive star, lies at the center of many galaxies
  • Galaxies - Definition, Examples, Quiz, FAQ, Trivia
    Discover galaxies in a visual way! Learn galaxy definitions, facts, examples, and test your knowledge with interactive quizzes Perfect for elementary and middle school students
  • What is a galaxy? - BBC Sky at Night Magazine
    A galaxy is a concentration of millions or billions of stars, gas clouds and pockets of dust, all bound by gravity and swathed in a cocoon of mysterious dark matter
  • Galaxy - Quickbytes Education - Astronomy
    A galaxy is a massive system of stars, planets, gas, dust, and dark matter held together by gravity Galaxies come in various shapes and sizes, ranging from small dwarf galaxies to massive spiral giants





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