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Types of Galaxies. 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 according to the Hubble classification scheme : an E indicates a type of elliptical galaxy; an S is a spiral; and SB is a barred spiral galaxy. Galaxies come in three main types: ellipticals, spirals, and irregulars. A slightly more extensive description of galaxy types based on their appearance is given by the Hubble sequence.
Jan 31, 2024 · Learn about the three main types of galaxies (elliptical, spiral and irregular) and how they differ in shape, size and star formation. Discover the evidence for dark matter and how it affects galaxy evolution and clustering.
Jan 19, 2022 · Types of Galaxies. 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.
- Spiral Galaxies
- Elliptical Galaxies
- Irregular Galaxies
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Spiral galaxies are the most common type in the universe. Our Milky Way is a spiral, as is the rather close-by Andromeda Galaxy. Spirals are large rotating disks of stars and nebulae, surrounded by a shell of dark matter. The central bright region at the core of a galaxy is called the “galactic bulge”. Many spirals have a halo of stars and star clu...
Elliptical galaxies are roughly egg-shaped (ellipsoidal or ovoid) found largely in galaxy clusters and smaller compact groups. Most ellipticals contain older, low-mass stars, and because they lack a great deal of star-making gas and dust clouds, there is little new star formation occurring in them. Ellipticals can have as few as a hundred million t...
Irregular galaxies are as their name suggests: irregular in shape. The best example of an irregular that can be seen from Earth is the Small Magellanic Cloud. Irregulars usually do not have enough structure to characterise them as spirals or ellipticals. They may show some bar structure, they may have active regions of star formation, and some smal...
Learn about the three main types of galaxies: spirals, ellipticals and irregulars, and their subgroups based on shape, size, structure and star formation. See examples of each type and how they are classified by astronomers.
Learn about the four main types of galaxies in the universe: elliptical, spiral, barred spiral, and irregular. See stunning images of these galaxies and how they are classified by their shape and structure.
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Jun 23, 2024 · Learn about galaxies, the systems of stars and interstellar matter that make up the universe. Explore the history, structure, evolution, and classification of galaxies, from dwarf to giant, from elliptical to spiral.
