The Hubble classification for a galaxy having a disk and central bulge, with a smooth light distribution but no spiral arms, is:

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The Hubble classification for a galaxy with a central bulge and disk but no spiral arms is an S0 galaxy. This type of galaxy is sometimes called a lenticular galaxy and has a smooth light distribution. The absence of spiral arms distinguishes it from a spiral galaxy, while the presence of a disk and central bulge distinguishes it from an elliptical galaxy.

The Hubble Classification for a Galaxy Having a Disk and Central