What type of galaxy contains mainly older stars and has an oval shape?

An elliptical galaxy is characterized by its oval shape and the predominance of older stars. Unlike spiral galaxies, which have a more defined structure with spiral arms and actively forming stars, elliptical galaxies lack this structure and typically have a smoother, more rounded appearance. The older stars in elliptical galaxies are often redder in color because they have moved beyond their main sequence stage and are typically cooler than younger stars found in spiral galaxies.

Additionally, elliptical galaxies can range from nearly spherical to elongated shapes and contain less interstellar gas and dust, which means there is minimal star formation compared to spiral galaxies. This distinction highlights the nature of stellar populations within these galaxies and their evolutionary status. As a result, the characteristics of elliptical galaxies make them unique in the broader classification of galaxies.