Galaxy - Wikipedia
A galaxy is a system of stars, stellar remnants, interstellar gas, dust, and dark matter bound together by gravity. The word is derived from the Greek galaxias (γαλαξίας), literally 'milky', a reference to the Milky Way galaxy that contains the Solar System.
What Is a Galaxy? | NASA Space Place - NASA Science for Kids
Astronomers classify galaxies into three major categories: elliptical, spiral and irregular. These galaxies span a wide range of sizes, from dwarf galaxies containing as few as 100 million stars to giant galaxies with more than a trillion stars.
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A galaxy is a vast island of gas, dust and stars in an ocean of space. Learn about the three types of galaxies (spiral, elliptical and irregular), how many there are in the universe, and how they are classified by Hubble. Discover the history and discoveries of astronomy and the universe.
Galaxies - Science@NASA
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Galaxy | Definition, Formation, Types, Properties, & Facts
Learn how galaxies form and evolve from the Center for Astrophysics | Harvard & Smithsonian, a leading research institution for astronomy and astrophysics. Explore the ways galaxies grow, change, and interact with each other, and how they are shaped by supermassive black holes, dark matter, and other factors.
Galaxies | HubbleSite
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Galaxies—facts and information - National Geographic
In Hubble's scheme, which is based on the optical appearance of galaxy images on photographic plates, galaxies are divided into three general classes: ellipticals, spirals, and irregulars. Hubble subdivided these three classes into finer groups.
What is a galaxy? All you need to know - EarthSky
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Types of Galaxies | NASA Space Place - NASA Science for Kids
Learn about the different types of galaxies, such as spiral, elliptical, lenticular, irregular, and active. See images and explanations of their shapes, features, and origins.
Size, composition, and structure of galaxies | Britannica
A galaxy is a huge collection of gas, dust, and billions of stars all held together by gravity. All galaxies are made up of these same things. However, they come in many different shapes and sizes. Here are a few types of galaxies: Spiral galaxies look like giant pinwheels. The arms of the pinwheel are made up of stars and lots of gas and dust.