What is the shape of a Spiral Galaxy?

Answer 1

Spiral galaxies are named for the (usually two armed) spiral structures that extend from the centre into the disk.

The spiral arms are sites of ongoing star formation and are brighter than the surrounding disk because of the young, hot stars.

See related link for a pictorial representation.

Answer 2

-here are some more characteristics on spiral galaxies- Some spiral galaxies appear to have a bulge in the middle and arms that outward,like pinwheels. Such galaxies are called spiral galaxies. The spiral arms contain many bright, young stars as well as gas and dust. Most new stars in spiral galaxies form in these arms. Relatively few new stars are forming in the central bulge.

-GOT THIS FROM SCIENCE BOOK!!!!- (NOT OUT OF MY OWN WORDS)

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Answer 3

A spiral galaxy has a distinctive spiral arm structure, with a central bulge where the majority of its mass is concentrated. The arms typically contain young stars, gas, and dust, while the central bulge consists of older stars.