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A galaxy is a gravitationally bound system of stars, stellar remnants, interstellar gas, dust, and ..... At the other extreme, an Sc galaxy has open, well-defined arms and a small core region. A gal...

Galaxy | Define Galaxy at Dictionary.com


Galaxy definition, a large system of stars held together by mutual gravitation and isolated from similar systems by vast regions of space. See more.

galaxy - Dictionary Definition : Vocabulary.com


The Earth's galaxy is known as the Milky Way. Our solar system, made up of the Sun and the planets that encircle it, is a tiny part of that galaxy. A galaxy can also  ...

What is a Galaxy? | NASA Blueshift


Sep 17, 2012 ...Galaxy,” Defined — when I came across a paper with this title while browsing a recent issue of Astronomical Journal, I was intrigued.

What Is a Galaxy? | Science | AAAS


Jan 27, 2011 ... A pair of astronomers call for a debate on a tricky definition. ... You might think a galaxy is simply a large group of stars, but just how many stars ...

Galaxy | Definition of Galaxy by Merriam-Webster


astronomy : any one of the very large groups of stars that make up the universe. the Galaxy : the galaxy in which we live. : a large group of important or ...

Galaxy dictionary definition | galaxy defined - YourDictionary


The definition of a galaxy is a large area, particularly of dust, stars and gas that makes up a universe. An example of a galaxy is the Milky Way. YourDictionary ...

Spiral Galaxy Facts & Definition - Space.com


Aug 15, 2013 ... A spiral galaxy has a distinct winding shape. Most of the galaxies observed by astronomers are spiral galaxies.

Galaxy - definition of galaxy by The Free Dictionary


a. Any of numerous large-scale aggregates of stars, gas, and dust that constitute the universe, containing an average of 100 billion (10<sup>11</sup>) solar masses and ...

What defines a galaxy? - Scientific American


Apr 26, 2004 ... It is slightly easier to define what doesn't constitute a galaxy. Any object that can exist as a distinct unit inside a galaxy isn't a galaxy, which ...

any large and brilliant or impressive assemblage of persons or things: a galaxy of opera stars.
Source: Dictionary.com
galaxy | Define galaxy at Dictionary.com
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