Which of the following is a major difference between elliptical galaxies and spiral galaxies?

Major difference is in their shape.

Galaxies are large cluster of billions of stars in universe. Galaxies are of different shapes: elliptical, spiral, Lenticular and irregular. An elliptical galaxy is three dimensional ellipsoidal shaped galaxy. Spiral galaxy is the most common type found in the universe. It has different arms, disk and halo region. Milky way is also a spiral galaxy.

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definition

                    entropy is a measure of the randomness or the extent of disorder of a chemical process.

                      enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

                        entropy is measured in joule per kelvin (jk⁻¹)   whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

                            entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

                              in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.