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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 Formation and Evolution - Center for Astrophysics
    Galaxies are home to most of the stars in the universe, and they form the beads of the cosmic jewelry that defines structure on the largest scales But galaxies haven’t always been around, and they have changed over the universe’s 13 8 billion-year history Astronomers study the ways galaxies form and evolve by comparing the different shapes across the history of the cosmos, and tracing
  • Galaxies | Astronomy. com
    Galaxies are vast collections of stars, gas, dust, and dark matter bound together by gravity There are hundreds of billions of galaxies in the universe
  • Galaxies, the cosmic cities of the universe, explained by . . .
    Galaxies are glittering cities, massive metropolises full of stars, dust, gas, black holes, magnetic fields, cosmic rays, dark matter and more Separated by millions of light-years of essentially
  • Galaxies Over Time - Science@NASA
    Understanding Galaxies Galaxies show us how the matter in the universe is organized on large scales In order to understand the nature and history of the universe, scientists study how the matter is currently organized and how that organization has changed through out cosmic time
  • Galaxies - Imagine the Universe!
    Interacting galaxies imaged by the Hubble Space Telescope (Credit: NGC 4676: NASA, H Ford (JHU), G Illingworth (UCSC LO), M Clampin (STScI), G Hartig (STScI), the ACS Science Team, and ESA; Antennae: NASA, ESA, and the Hubble Heritage Team (STScI AURA)-ESA Hubble Collaboration UGC 8334: NASA, ESA, the Hubble Heritage (STScI AURA)-ESA Hubble Collaboration, and A Evans (University of
  • What Are Galaxies? (With Understandable Details) - Owlcation
    The supermassive black hole is the gravitational glue that holds things together and directs an inward motion Technically, there is no rule that only one supermassive black hole exists in a galaxy, and binary black holes have been found holding galaxies together
  • Types of Galaxies | Pictures, Facts, and Information - AstroBackyard
    The Andromeda Galaxy Photo by Trevor Jones Lenticular Galaxy Briefly elaborating, S0 galaxies are like a combination between a spiral galaxy and elliptical galaxy because of the bulge and disk that they do have, like spiral galaxies, but they do not have a spiral-like structure A lenticular galaxy is a type of galaxy intermediate between an elliptical galaxy and a spiral galaxy
  • How Galaxies Work - HowStuffWorks
    Galaxies come in a variety of sizes and shapes They can have as few as 10 million stars or as many as 10 trillion (the Milky Way has about 200 billion stars) In 1936, Edwin Hubble classified galaxy shapes in the Hubble Sequence
  • What’s a galaxy? All you need to know - EarthSky
    What is a galaxy? A galaxy is a vast island of gas, dust and stars in an ocean of space Typically, galaxies are millions of light-years apart Galaxies are the building blocks of our universe
  • Size, composition, and structure of galaxies | Britannica
    galaxy, Any of the billions of systems of stars and interstellar matter that make up the universe Galaxies vary considerably in size, composition, structure, and activity, but nearly all are arranged in groups, or clusters, containing from a few galaxies to as many as 10,000
  • Galaxies Over Time - Webb
    Galaxy Group: Webb’s enormous mosaic of Stephan’s Quintet shows sparkling clusters of millions of young stars, starburst regions, and sweeping tails of gas, dust and stars Read about this group Credit: NASA, ESA, CSA, STScI Galaxy Cluster: Webb observed seven galaxies that existed 650 million years after the big bang and confirmed that they are part of a developing cluster of galaxies
  • What is a galaxy? - Live Science
    Galaxies take on many different shapes and forms throughout the cosmos When you purchase through links on our site, we may earn an affiliate commission Here’s how it works Galaxies are groups
  • Types of Galaxies | NASA Space Place – NASA Science for Kids
    Explore the different types of galaxies! A galaxy is a huge collection of gas, dust, and billions of stars all held together by gravity
  • Webb Telescope Unveils 83 Starburst Galaxies That . . . - SciTechDaily
    Webb discovered dozens of small, powerful galaxies from 800 million years ago that likely drove cosmic reionization by emitting strong ultraviolet radiation Astronomers using data from NASA’s James Webb Space Telescope have discovered dozens of small galaxies that played a key role in reshaping





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