Which of the following le NOT one of the main parts of spiral galaxy? the dise the bulge the creacent

## Step 1<br />A spiral galaxy is a type of galaxy that has a spiral structure. It consists of several main parts, including the disk, the bulge, and the halo. <br /><br />## Step 2<br />The disk is the flat, spinning part of the galaxy that contains the spiral arms. <br /><br />## Step 3<br />The bulge is a dense, central region of stars. <br /><br />## Step 4<br />The halo is a roughly spherical region that surrounds the galaxy. <br /><br />## Step 5<br />The crescent is not a recognized part of a spiral galaxy.