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Classification of galaxies according to their form, devised by astronomer Edwin Hubble in the 1920s; it is still used today.

See Hubble’s classification in : french | spanish

Spherical or oval galaxy with no spiral arms.

Flat, lens-shaped galaxy with a large bulge but no arms.

Galaxy crossed by a bar of stars and interstellar matter; the spiral arms emerge from the ends of the bar.

Galaxy composed of a large nucleus from which spiral arms emerge.

Rare type of galaxy whose structure obeys no specific symmetry.

Rare type of galaxy that seems to possess spiral arms without displaying a specific symmetry.