Galaxy type without a definite shape

Answer;

Irregular galaxy

Explanation.Galaxies are named for their shape, making it easy for observers to identify them.Irregular galaxies are types of galaxies that are neither spiral nor elliptical. they are named irregular as they have no definite shape however, like other galaxies they are in constant motion, moving awy from the center of the universe.These galaxies tend to be smaller objects that lacks definite shape and also appear to have hot newer stars that are mixed with gases and dust.Many of these irregular galaxies were once spiral or elliptical and were then deformed by gravitational attraction to a larger galaxy or by a collision with another galaxy.

The light is great source of energy