Which of these statements describes a way in which galaxies evolve on the Hubble tuning-fork diagram?
A) Galaxies begin as type E0 and evolve to lenticular and then continue as either normal or barred spirals.
B) Galaxies are created as either normal or barred spirals, but either eventually evolves to lenticular. These then evolve through the various types of ellipticals.
C) Everything starts as a lenticular galaxy. Then, for reasons not well understood, the subsequent evolution is either as a spiral (normal or barred) or as an elliptical.
D) Spiral galaxies merge to form giant elliptical galaxies.

Question

Quizplus · Accepted Answer

The Hubble tuning-fork diagram classifies galaxies based on their shape, and it is thought that through the process of merging, spiral galaxies can evolve into giant elliptical galaxies. This is a simplification, but it captures a key aspect of galaxy evolution.

Which of These Statements Describes a Way in Which Galaxies