universetoday.com
Why Do Galaxies Have Arms?
Spiral galaxies get their name because of their beautiful spiral shape and iconic arms. But why do galaxies have these spiral shapes, and what causes the arms? Galaxies are some of the most beautiful and inspiring structures in the Universe. As you know, they aren’t solid disks, they’re a gigantic spill of individual stars webbed … Continue reading "Why Do Galaxies Have Arms?"
Fraser Cain