Why do galaxies have different shapes?

Take a look at the night sky and you will see the stars of hundreds of billions of galaxies. Some galaxies revolve around a blue disk like our own galaxy, others are red spheres or mispen, clumsy messy or something in between. Why different configurations? It turns out that the shape of the galaxy tells us something about the ultra-long life events of that galaxy.

At a very basic level there are two classifications for galaxy shapes: disk and ellipse. The disk galaxy, also called the spiral galaxy, is like a fried egg, said Cameron Hummel, a theoretical astrophysicist at Caltech. These galaxies have more spherical centers, yolk-like, surrounded by gas and stellar disks – egg whites. The Milky Way galaxy and our nearest galaxy Andromeda fall into this category.