How do spiral and elliptical galaxies differ from each other?
Mainly due to the formation of massive stars.
Firstly in their appearances and Secondly due to formation of stars. In Spiral galaxies Stars (All big and small) will continue to form with the age of the galaxies so, in a Spiral galaxies you will usually see all types of stars Ranging from Red Dwarfs to Blue Hypergiants. In Elliptical galaxies however, Massive stars form only in the starting time of a galaxy and they Stop forming as the galaxy gets older. So, in an elliptical galaxy you will only find some Main sequence and A large number of Red Dwarfs but a very few or NO Massive stars, provided that the galaxy has not just formed.