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Elliptical galaxy facts for kids

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Abell S740, cropped to ESO 325-G004
The giant elliptical galaxy ESO 325-G004

An elliptical galaxy is a galaxy having an ellipsoidal shape, and a smooth, nearly featureless brightness profile. They are one of the three main types of galaxy originally described by Edwin Hubble in 1936. The others are spiral and lenticular galaxies.

Elliptical galaxies range in shape from nearly spherical to nearly flat, (E7, one of the flattest types of elliptical galaxies is cigar-shaped) and in size from hundreds of millions to over one trillion stars. Originally, Edwin Hubble thought that elliptical galaxies may evolve into spiral galaxies, but this turned out to be false. Stars found inside elliptical galaxies are much older (and cooler; thus redder) than stars found in spiral galaxies.

Most elliptical galaxies are composed of older, low-mass stars, with a sparse interstellar medium and minimal (or no)star formation activity. They tend to be surrounded by large numbers of globular clusters. Elliptical galaxies are believed to make up approximately 10–15% of galaxies in the Virgo Supercluster, but are not the dominant type of galaxy in the universe overall. They are usually found close to the centers of galaxy clusters.

Elliptical galaxies and lenticular galaxies are also called "early-type" galaxies (ETG), due to their position in the Hubble sequence. They are less common in the early Universe, that is, in galaxies further away from us.

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Kids robot.svg In Spanish: Galaxia elíptica para niños

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