Answer the following question given this paragraph: Spiral galaxies have a rotating disk of stars and dust, a bulge in the middle, and several arms spiraling out from the center. The disk and arms contain many young, blue stars. Q: What type of galaxies have a rotating disk of stars and dust, a bulge in the middle, and several arms? Choices: - pinwheel galaxies - round galaxies - spherical galaxies - spiral galaxies A:
spiral galaxies