Scopin'USA - Galaxies Galaxies Galaxies are the major building blocks of the universe.
Galaxies are some of the most treasured objects for visual and photographic studies.
They reveal the cronological evolution of our universe. Types of Galaxies Galaxies formed very early in the Universe's life and continue to form and change today. Four general categories describe basic galaxy structure. They are elliptical, spiral, barred spiral and irregular. Elliptical galaxies are subcategorized as E0 through E7, E0 being nearly spherical without internal structure to E7 being lenticular without internal structure.