spiral galaxies http://www.space.com/22382-spiral-galaxy.html http://www.space.com/22382-spiral-galaxy.html http://www.space.com/22382-spiral-galaxy.html spiral galaxies like our own Milky Way "Spiral Galaxy Facts & Definition" http://www.space.com/22382-spiral-galaxy.html spiral galaxy and its twisting arms spiral galaxy and its twisting arms