Define spiral galaxy.
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spiral galaxies form a class of galaxy originally described by Edwin Hubble in his 1936 work
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Spiral galaxy is the one that is formed with the class of galaxy.
These galaxies are described in 1936 by Edwin Hubble in his famous work ‘The Realm of the Nebulae”.
They are mainly the rotating, flat disk that is formed by the gas, star and dust with a concentration of stars.
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