What are the main differences between spiral and elliptical galaxies?

elliptical galaxies tend to have mostly older stars and less gas and matter, which means that they are smaller than spiral galaxies. They also have low rates of star formation due to the lack of gas.

Spiral galaxies like our own Milky way, tends to have a collection of young and old stars. There is more gas and matter and the younger stars are mainly on the arms on the spiral. Spiral galaxies are the most common type of galaxy in the universe.

elliptical galaxies have more mass, elliptical have older redder stars, elliptical galaxies used to be spiral but merged with others to make elliptical