What term describes an enormous collection of stars arranged in a particular shape?

The term that describes an enormous collection of stars arranged in a particular shape is "galaxy." A galaxy is a vast system that includes not only stars but also gas, dust, and dark matter, all bound together by gravity. Galaxies can take on various shapes, commonly categorized as spiral, elliptical, or irregular. The Milky Way, where our solar system resides, is an example of a spiral galaxy.

In contrast, a planet refers to a celestial body orbiting a star, such as Earth or Mars, while a solar system is a collective term for a star and all the objects orbiting it, including planets, moons, asteroids, and comets. A cluster typically refers to a group of stars or galaxies that are gravitationally bound but does not encompass the large formation of stars that define a galaxy. Thus, "galaxy" is the correct term for an enormous collection of stars arranged in a particular shape.