Question

What is the biggest difference between spiral galaxies and elliptical galaxies?

Answer 1

Their shape.

Explanation:

An elliptical galaxy has an ellipse shape while a spiral galaxy is like an elliptical galaxy BUT it has arms.

This is an ELLIPTICAL GALAXY:

http://lainfo.es/en/2014/07/22/perform-more-extensive-investigation-of-an-elliptical-galaxy/

This is a SPIRAL GALAXY:

https://www.google.com.ph/search?sclient=psy-ab&site=&source=hp&btnG=Search&q=spiral+galaxy