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Elliptical galaxies may be the biggest in our universe. They have over a trillion stars, and can have a diameter that is 10x our Milky Way.

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Most spiral galaxies contain a central bulge surrounded by a flat, rotating disk of stars.

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Irregular galaxies are thought to have once been elliptical or spiral galaxies that lost their shape.

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By studying the light emitted from various galaxies, Edwin Hubble proposed a classification system for galaxies, based on their shape as observed from Earth. Today we discover new galaxies by using telescopes.