The appearance of spiral galaxies vary in the following ways:
A. They vary in how tightly their arms are wound.
D. Some have a band of stars and materials through their middle, but others do not
Spiral galaxies are the galaxies where the gas clouds and the stars are concentrated in spiral arms.
Examples of spiral galaxies include<em> Milky way, Sunflower Galaxy, Andromeda Galaxy, </em>etc.
It should be noted that <em>spiral galaxies</em> vary in how tightly their arms are wound while some have a band of stars and materials through their middle, but others do not.
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