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Scientist discovered and identified galaxies by first looking up in the sky and seeing a number of fuzzy objects and deciding that they where not comets. Then Hubble studied the light emitted from various galaxies.  When Hubble measured the distance to the andromeda galaxies using telescopes.

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Type of galaxy with an approximately ellipsoidal shape. They have far less structure than spiral galaxy.

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A spiral galaxy consists of flat, rotating disk containing stars gas and dust.

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Example of spiral galaxy - Milky Way galaxies 

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Example of spiral galaxy - Milky Way galaxies 

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A spiral galaxy does not have a distinct regular shape. They are chaotic in appearance.

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Irregular galaxy example - large and small Magellanic Clouds 

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Irregular galaxy example - large and small Magellanic Clouds 