All stars are approximately spherical.
No. A constellation is a collection of stars that form a recognizable shape. All the stars we see in the constellations are in our own galaxy, the Milky Way.
An irregular galaxy is a galaxy with no definite shape like spirals, lenticulars, and ellipticals.
That sounds like the description of an "elliptical galaxy".
A galaxy is by a definition a group of stars. If there were no stars it could not be a galaxy.
Every galaxy contains stars, if that's what you mean. "Galaxy" means "big bunch of stars". No stars ===> no galaxy.
The same stellar materials and dust any other galaxy is made of - it just hasn't taken on a coherent shape - yet, or possibly it had a collision encounter with another galaxy, leaving it "irregular" - either is possible.
Elliptical Galaxy The Elliptical Galaxy has mostly old stars and blue stars are new stars.
Our galaxy, the Milky Way, is a spiral galaxy. It consists of a central bulge surrounded by spiral arms that contain stars, gas, and dust. We are located on one of the outer arms of the galaxy.
elliptical galaxy. These galaxies are often round or elongated in shape, resembling a football or an elongated sphere. They are composed mostly of old stars and lack the distinct spiral arms seen in spiral galaxies.
andrometa. it is the biggest galaxy near the milky way it is the same age same shape but has many more stars
An irregular galaxy is a galaxy that doesn't have a specific shape like a pinwheel or an elliptical galaxy.
If it didn't have stars it wouldn't be a galaxy