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Spiral galaxies are twisted collections of stars and gas that often have beautiful shapes and are made up of hot young stars. ... Most spiral galaxies contain a central bulge surrounded by a flat, rotating disk of stars.

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The bulge and halo of the Milky Way. Are composed mostly of old stars. This indicates that the bulges and halos of spiral galaxies probably formed through the primordial collapse of individual gas clouds early in the history of the Universe.

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An irregular galaxy is the catchall name given to any galaxy that does not neatly fit into one of the categories of the Hubble classification scheme. They have no defined shape nor structure and may have formed from collisions, close encounters with other galaxies or violent internal activity.

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Elliptical galaxies are round and smooth. They contain older stars and have less gas than other galaxies.

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Irregular galaxies get their odd shapes in many ways. One way irregular galaxies are formed is when galaxies collide or come close to one another, and their gravitational forces interact. Another source of irregular galaxies may be very young galaxies that have not yet reached a symmetrical state. Also known as peculiar galaxies, these non-conformists are thought to make up around a quarter of all known galaxies. In general, irregular galaxies contain large amounts of gas and dust, and can exhibit a significant degree of star formation activity.

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How Is An Elliptical Galaxy Formed-Domenick

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How Is An Elliptical Galaxy Formed-Domenick

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The universe is a violent place, and collisions between galaxies are frequent — indeed, the Milky Way is due to crash into the Andromeda Galaxy in a few billion years. When two spirals collide, they lose their familiar shape, morphing into the less-structured elliptical galaxies.

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The Milky Way – the galaxy that includes Earth and our solar system – is an example of a spiral galaxy. ... Most spiral galaxies contain a central bulge surrounded by a flat, rotating disk of stars. The bulge in the center is made up of older, dimmer stars, and is thought to contain a supermassive black hole.

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An elliptical galaxy is a type of galaxy with an approximately ellipsoidal shape and a smooth, nearly featureless image. ... They are preferentially found close to the centers of galaxy clusters. Elliptical galaxies range in size from tens of millions to over one hundred trillion stars.