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.
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.
Types of Galaxies | Pictures, Facts, and Information - AstroBackyard
There are four distinct types of galaxies in the universe, elliptical, spiral, barred spiral, and irregular. Although these are the four main types, there are various types of galaxies and the way in which they are classified is by their shape. A galaxy is a cluster of stars, gas, and dust that are kept together by the force of gravity. Within ...
Galaxies - NASA Science
Galaxies come in a variety of shapes, mostly spirals and ellipticals, as well as those with less orderly appearances, usually dubbed irregular. Most galaxies are between 10 billion and 13.6 billion years old. Some are almost as old as the universe …
Galaxies - HubbleSite
2024年10月28日 · Galaxies are vast cosmic islands of stars, gas, dust, and dark matter held together by gravity. Hubble’s keen eye has revealed intricate details of the shapes, structures, and histories of galaxies — whether alone, as part of small groups, or within immense clusters.
list of galaxies and galaxy clusters - Encyclopedia 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. Galaxy clusters are gravitationally bound groupings of galaxies, numbering from the …
What are the different types of galaxies in the universe?
2022年9月20日 · What are the 4 main classifications of galaxies? Hubble created the Hubble Sequence classification system in 1926, which tends to be used by both professional and amateur astronomers today. This tuning fork diagram shows the …
Types of Galaxies | NASA Space Place – NASA Science for Kids
2022年1月19日 · 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.
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 …
Different Types of Galaxies In The Universe - RankRed
2020年10月25日 · There are an estimated two trillion galaxies or more in the observable universe. Most of the discovered galaxies to date have distinct features and vary largely in shapes and sizes.
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