Triangles
There's an impossible way to classify all the shapes of 100 billion galaxies in the universe.
Someday astronomers may have classified all the shapes of 100 billion galaxies in the observable universe.
Irregular galaxies have no discernible shape.
Yes
Spiral and irregular galaxies.
There are various ways of categorising galaxies, often based on Edwin Hubble's work on the shapes galaxies. Classifications often give the four main types of galaxies as: Spiral (including barred spiral), Elliptical, Lenticular and Irregular.
There are three types of galaxies, all of which are the same, with the exception of their shapes. There are the Elliptical galaxies (football-shaped) the Spiral galaxies (like the Milky way; vortex-shaped) and Irregular galaxies (all shapes other than spiral and football shaped).
Yes. All 100 billion galaxies come in all shapes, sizes, and colors.
GRAVITY!
Yes. All ~100 billion galaxies in the universe come in all shapes, sizes, and colors.
they think that....
A galaxy is a vast region of interstellar space gravitationally bound as a single, independent unit and rotating about a common center. Galaxies come in many sizes and shapes and contain an important, but poorly understood component called dark matter.