spiral articles
Is our galaxy spiral elliptical or irregular?
Is every galaxy a spiral?
What is the density wave theory for spiral arm formation?
What causes the waves to glow in a spiral galaxy?
Do spiral galaxies have star formation?
What is found in a spiral galaxy?
Is a spiral galaxy gas or dust?
How fast do spiral galaxies spin?
How does star formation differ in elliptical and spiral galaxies?
Does a spiral galaxy have gas and dust?
