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An elliptical galaxy is, by it’s name, a galaxy that possesses an elliptical, mostly featureless, shape.

An example of an elliptical galaxy is Cygnus A.

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A spiral galaxy is a galaxy that which has spinning discs that move in a spiral rotation, that curve in dense masses.

An example of a spiral galaxy is the Milky Way, also known as our galaxy.

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A galaxy that lacks a distinct, identifiable shape. These do not classify under any identifiable Hubble concepts.

An example of an irregular galaxy is the Canis Major Dwarf

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The first classification of a galaxy was identified by Charles Messier. This was at a time in which galaxies did not have a distinct identifiability in astronomy.