List of galaxies - Wikipedia
There are about 51 galaxies in the Local Group (see list of nearest galaxies for a complete list), on the order of 100,000 in the Local Supercluster, and an estimated 100 billion in all of the observable universe. [1] The discovery of the nature of galaxies as distinct from other nebulae (interstellar clouds) was made in the 1920s.
Galaxy Types - Science@NASA
Scientists sometimes categorize galaxies based on their shapes and physical features. Other classifications organize galaxies by the activity in their central regions – powered by a supersized black hole – and the angle at which we view them.
Types of Galaxies | Pictures, Facts, and Information - AstroBackyard
A galaxy is a cluster of stars, gas, and dust that are kept together by the force of gravity. Within galaxies, there are also planets, black holes, moons, comets, and dark matter.
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.
Lists of galaxies - Wikipedia
A galaxy is a system of stars, stellar remnants, interstellar gas, dust, dark matter, bound together by gravity. The word is derived from the Greek galaxias, literally 'milky', a reference to the Milky Way galaxy that contains the Solar System.
list of galaxies and galaxy clusters - Encyclopedia Britannica
Galaxy clusters are gravitationally bound groupings of galaxies, numbering from the hundreds to the tens of thousands. This is an alphabetically ordered list of selected galaxies and galaxy clusters. (See also astronomy; cosmology; list of stars; nebula; protogalaxy; star …
The Different Types of Galaxies - WorldAtlas
2022年12月22日 · In total, there are four main groups of galaxies: spiral, elliptical, irregular, and peculiar. Each of these types of galaxies have their own unique features and history, adding more beauty to an already stunning universe. Hubble image of …
How Many Types of Galaxies Are There? | My Space Museum
Galaxies, the cosmic metropolises of the universe, display three primary types: Spirals, Ellipticals, and Irregulars. Spirals like the Andromeda Galaxy boast majestic arms spiraling from a central nucleus, featuring vibrant star-forming regions. Ellipticals, in contrast, adopt a spherical shape, radiating a serene ambiance through aging stars.
Galaxy - Elliptical, Spiral, Irregular | Britannica
2024年12月21日 · Know how galaxies categorized according to their shape, such as elliptical, spiral, or irregular Learn about the three general types of galaxies: spiral, elliptical, and irregular. Almost all current systems of galaxy classification are outgrowths of the initial scheme proposed by the American astronomer Edwin Hubble in 1926.
Explore the Different Types of Galaxies - ThoughtCo
2020年1月10日 · Galaxies come in different types, including spirals like Andromeda or the Milky Way. There are many other types of galaxies, classified by shape.
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