* Elliptical galaxies are characterized by their smooth, oval shapes and lack of spiral arms. They contain a much higher proportion of old, red stars compared to other galaxy types.
* The central bulge: Elliptical galaxies have a prominent, dense central bulge where a large number of stars are concentrated. This bulge is where the galaxy's supermassive black hole often resides.
* Lack of gas and dust: Elliptical galaxies have relatively little gas and dust compared to spiral galaxies. This means they have fewer star-forming regions and less active star formation occurring in their outer regions.
In contrast, spiral galaxies have a more distributed star distribution with a central bulge and a prominent disk where star formation is ongoing. They also possess spiral arms where younger, bluer stars are found.
Therefore, elliptical galaxies exhibit a stronger concentration of stars towards their central regions compared to other galaxy types.
