Answer:
Galaxies can be grouped by the age of the stars they tend to contain, with irregular galaxies having the youngest stars and elliptical galaxies having the oldest stars.
The galaxies having the youngest stars are called;
Irregular Galaxies
The galaxies having the Oldest stars are called;
Elliptical galaxies
There are 3 major categories of galaxies namely;
Spiral Galaxy
Irregular Galaxy
Elliptical Galaxy
Spiral Galaxy; This is a galaxy that is made up of a spinning and flattened disk whose arms rotate at a very fast speed.
Elliptical Galaxy; This is the most popular type of galaxy. It has a round shape, and possesses little star formations that are very old and contain less gas.
Irregular Galaxy; This galaxy by its' name has an irregular shape with starts that are very young.
Looking at our definitions, the one with oldest stars is Elliptical galaxies while the one with youngest stars in Irregular Galaxies.
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